diff --git a/src/all/mangadventure/build.gradle b/src/all/mangadventure/build.gradle
index 71c1a9fa7..80bcbdfed 100644
--- a/src/all/mangadventure/build.gradle
+++ b/src/all/mangadventure/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'MangAdventure'
     pkgNameSuffix = 'all.mangadventure'
     extClass = '.MangAdventureFactory'
-    extVersionCode = 7
+    extVersionCode = 8
     libVersion = '1.2'
 }
 
diff --git a/src/all/mangadventure/src/eu/kanade/tachiyomi/extension/all/mangadventure/MangAdventureExtensions.kt b/src/all/mangadventure/src/eu/kanade/tachiyomi/extension/all/mangadventure/MangAdventureExtensions.kt
index d8c398373..1dd793644 100644
--- a/src/all/mangadventure/src/eu/kanade/tachiyomi/extension/all/mangadventure/MangAdventureExtensions.kt
+++ b/src/all/mangadventure/src/eu/kanade/tachiyomi/extension/all/mangadventure/MangAdventureExtensions.kt
@@ -80,7 +80,7 @@ val SChapter.path: String
  */
 fun SChapter.fromJSON(obj: JSONObject) = apply {
     url = obj.getString("url")
-    chapter_number = obj.optString("chapter", "0").toFloat()
+    chapter_number = obj.optString("chapter", "-1").toFloat()
     date_upload = MangAdventure.httpDateToTimestamp(obj.getString("date"))
     scanlator = obj.getJSONArray("groups").joinField("name", " & ")
     name = obj.optString(
diff --git a/src/all/mangaplus/build.gradle b/src/all/mangaplus/build.gradle
index 723f696f1..d4f7b7b9e 100644
--- a/src/all/mangaplus/build.gradle
+++ b/src/all/mangaplus/build.gradle
@@ -6,7 +6,7 @@ ext {
     extName = 'MANGA Plus by SHUEISHA'
     pkgNameSuffix = 'all.mangaplus'
     extClass = '.MangaPlusFactory'
-    extVersionCode = 12
+    extVersionCode = 13
     libVersion = '1.2'
 }
 
diff --git a/src/all/mangaplus/src/eu/kanade/tachiyomi/extension/all/mangaplus/MangaPlus.kt b/src/all/mangaplus/src/eu/kanade/tachiyomi/extension/all/mangaplus/MangaPlus.kt
index f463bb0d8..bbbbccab2 100644
--- a/src/all/mangaplus/src/eu/kanade/tachiyomi/extension/all/mangaplus/MangaPlus.kt
+++ b/src/all/mangaplus/src/eu/kanade/tachiyomi/extension/all/mangaplus/MangaPlus.kt
@@ -238,7 +238,7 @@ abstract class MangaPlus(
                     scanlator = "Shueisha"
                     date_upload = 1000L * it.startTimeStamp
                     url = "#/viewer/${it.chapterId}"
-                    chapter_number = it.name.substringAfter("#").toFloatOrNull() ?: 0f
+                    chapter_number = it.name.substringAfter("#").toFloatOrNull() ?: -1f
                 }
             }
     }
diff --git a/src/all/toomics/build.gradle b/src/all/toomics/build.gradle
index 5fb34cc79..6d04ab7c7 100644
--- a/src/all/toomics/build.gradle
+++ b/src/all/toomics/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Toomics'
     pkgNameSuffix = 'all.toomics'
     extClass = '.ToomicsFactory'
-    extVersionCode = 4
+    extVersionCode = 5
     libVersion = '1.2'
 }
 
diff --git a/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt b/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
index 4c5d3d8dc..0a0084d13 100644
--- a/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
+++ b/src/all/toomics/src/eu/kanade/tachiyomi/extension/all/toomics/ToomicsGlobal.kt
@@ -126,7 +126,7 @@ abstract class ToomicsGlobal(
         val numText = if (num.isNotEmpty()) "$num - " else ""
 
         name = numText + element.select("div.cell-title")?.first()?.ownText()
-        chapter_number = num.toFloatOrNull() ?: 0f
+        chapter_number = num.toFloatOrNull() ?: -1f
         date_upload = parseChapterDate(element.select("div.cell-time time").text()!!)
         scanlator = "Toomics"
         url = element.select("a").attr("onclick")
diff --git a/src/en/vizshonenjump/build.gradle b/src/en/vizshonenjump/build.gradle
index cbabb3752..db1032467 100644
--- a/src/en/vizshonenjump/build.gradle
+++ b/src/en/vizshonenjump/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'VIZ Shonen Jump'
     pkgNameSuffix = 'en.vizshonenjump'
     extClass = '.VizShonenJump'
-    extVersionCode = 3
+    extVersionCode = 4
     libVersion = '1.2'
 }
 
diff --git a/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizShonenJump.kt b/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizShonenJump.kt
index 414e1a57a..724a86925 100644
--- a/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizShonenJump.kt
+++ b/src/en/vizshonenjump/src/eu/kanade/tachiyomi/extension/en/vizshonenjump/VizShonenJump.kt
@@ -167,7 +167,7 @@ class VizShonenJump : ParsedHttpSource() {
             date_upload = leftSide.select("td[align=right]").first()!!.text().toDate()
         }
 
-        chapter_number = name.substringAfter("Ch. ").toFloatOrNull() ?: 0F
+        chapter_number = name.substringAfter("Ch. ").toFloatOrNull() ?: -1F
         scanlator = "VIZ Media"
         url = element.attr("data-target-url")
     }
diff --git a/src/fr/mangakawaii/build.gradle b/src/fr/mangakawaii/build.gradle
index 8e88ea5e7..c5a04e92e 100644
--- a/src/fr/mangakawaii/build.gradle
+++ b/src/fr/mangakawaii/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Mangakawaii'
     pkgNameSuffix = 'fr.mangakawaii'
     extClass = '.MangaKawaii'
-    extVersionCode = 9
+    extVersionCode = 10
     libVersion = '1.2'
 }
 
diff --git a/src/fr/mangakawaii/src/eu/kanade/tachiyomi/extension/fr/mangakawaii/MangaKawaii.kt b/src/fr/mangakawaii/src/eu/kanade/tachiyomi/extension/fr/mangakawaii/MangaKawaii.kt
index 2863f4d42..a5ada6c9f 100644
--- a/src/fr/mangakawaii/src/eu/kanade/tachiyomi/extension/fr/mangakawaii/MangaKawaii.kt
+++ b/src/fr/mangakawaii/src/eu/kanade/tachiyomi/extension/fr/mangakawaii/MangaKawaii.kt
@@ -69,7 +69,7 @@ class MangaKawaii : ParsedHttpSource() {
         val chapter = SChapter.create()
         chapter.url = element.select("a.list-item__title").attr("href")
         chapter.name = element.select("a.list-item__title").text().trim()
-        chapter.chapter_number = element.select("a.list-item__title").text().substringAfter("Chapitre").replace(Regex("""[,-]"""), ".").trim().toFloatOrNull() ?: 0F
+        chapter.chapter_number = element.select("a.list-item__title").text().substringAfter("Chapitre").replace(Regex("""[,-]"""), ".").trim().toFloatOrNull() ?: -1F
         chapter.date_upload = parseDate(element.select("div.chapter-item__date").text())
         return chapter
     }
diff --git a/src/ja/nikkangecchan/build.gradle b/src/ja/nikkangecchan/build.gradle
index 4e9cdcc3a..2a1337d09 100644
--- a/src/ja/nikkangecchan/build.gradle
+++ b/src/ja/nikkangecchan/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Nikkangecchan'
     pkgNameSuffix = 'ja.nikkangecchan'
     extClass = '.Nikkangecchan'
-    extVersionCode = 1
+    extVersionCode = 2
     libVersion = '1.2'
 }
 
diff --git a/src/ja/nikkangecchan/src/eu/kanade/tachiyomi/extension/ja/nikkangecchan/Nikkangecchan.kt b/src/ja/nikkangecchan/src/eu/kanade/tachiyomi/extension/ja/nikkangecchan/Nikkangecchan.kt
index ca0228600..8550824d3 100644
--- a/src/ja/nikkangecchan/src/eu/kanade/tachiyomi/extension/ja/nikkangecchan/Nikkangecchan.kt
+++ b/src/ja/nikkangecchan/src/eu/kanade/tachiyomi/extension/ja/nikkangecchan/Nikkangecchan.kt
@@ -90,7 +90,7 @@ class Nikkangecchan : ParsedHttpSource() {
 
         return SChapter.create().apply {
             name = "$title - $dataTitle"
-            chapter_number = element.select("h4.episodeTitle").first().text().toFloatOrNull() ?: 0f
+            chapter_number = element.select("h4.episodeTitle").first().text().toFloatOrNull() ?: -1f
             scanlator = "Akita Publishing"
             setUrlWithoutDomain(baseUrl + episodePage.attr("data-src").substringBeforeLast("/"))
         }
diff --git a/src/pt/hipercool/build.gradle b/src/pt/hipercool/build.gradle
index 41c89a26b..1afe4d90a 100644
--- a/src/pt/hipercool/build.gradle
+++ b/src/pt/hipercool/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'HipercooL'
     pkgNameSuffix = 'pt.hipercool'
     extClass = '.Hipercool'
-    extVersionCode = 4
+    extVersionCode = 5
     libVersion = '1.2'
     containsNsfw = true
 }
diff --git a/src/pt/hipercool/src/eu/kanade/tachiyomi/extension/pt/hipercool/Hipercool.kt b/src/pt/hipercool/src/eu/kanade/tachiyomi/extension/pt/hipercool/Hipercool.kt
index a1a89fd38..4d5db20bd 100644
--- a/src/pt/hipercool/src/eu/kanade/tachiyomi/extension/pt/hipercool/Hipercool.kt
+++ b/src/pt/hipercool/src/eu/kanade/tachiyomi/extension/pt/hipercool/Hipercool.kt
@@ -168,7 +168,7 @@ class Hipercool : HttpSource() {
 
     private fun chapterListItemParse(book: JsonObject, obj: JsonObject): SChapter = SChapter.create().apply {
         name = obj["title"].string
-        chapter_number = obj["title"].string.toFloatOrNull() ?: 0f
+        chapter_number = obj["title"].string.toFloatOrNull() ?: -1f
         // The property is written wrong.
         date_upload = DATE_FORMATTER.tryParseTime(obj["publishied_at"].string)
 
diff --git a/src/pt/mangasproject/build.gradle b/src/pt/mangasproject/build.gradle
index ef3dc7a9a..ce049e44c 100644
--- a/src/pt/mangasproject/build.gradle
+++ b/src/pt/mangasproject/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'mangásPROJECT'
     pkgNameSuffix = 'pt.mangasproject'
     extClass = '.MangasProjectFactory'
-    extVersionCode = 14
+    extVersionCode = 15
     libVersion = '1.2'
 }
 
diff --git a/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProject.kt b/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProject.kt
index 8306d1ff6..a6fa76a3a 100644
--- a/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProject.kt
+++ b/src/pt/mangasproject/src/eu/kanade/tachiyomi/extension/pt/mangasproject/MangasProject.kt
@@ -239,7 +239,7 @@ abstract class MangasProject(
                     .sorted()
                     .joinToString()
                 url = release["link"].string
-                chapter_number = obj["number"].string.toFloatOrNull() ?: 0f
+                chapter_number = obj["number"].string.toFloatOrNull() ?: -1f
             }
         }
     }
diff --git a/src/pt/saikaiscan/build.gradle b/src/pt/saikaiscan/build.gradle
index b2d1a711b..b73d10d1e 100644
--- a/src/pt/saikaiscan/build.gradle
+++ b/src/pt/saikaiscan/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Saikai Scan'
     pkgNameSuffix = 'pt.saikaiscan'
     extClass = '.SaikaiScan'
-    extVersionCode = 3
+    extVersionCode = 4
     libVersion = '1.2'
 }
 
diff --git a/src/pt/saikaiscan/src/eu/kanade/tachiyomi/extension/pt/saikaiscan/SaikaiScan.kt b/src/pt/saikaiscan/src/eu/kanade/tachiyomi/extension/pt/saikaiscan/SaikaiScan.kt
index 228d6ce92..222456220 100644
--- a/src/pt/saikaiscan/src/eu/kanade/tachiyomi/extension/pt/saikaiscan/SaikaiScan.kt
+++ b/src/pt/saikaiscan/src/eu/kanade/tachiyomi/extension/pt/saikaiscan/SaikaiScan.kt
@@ -119,7 +119,7 @@ class SaikaiScan : ParsedHttpSource() {
 
     override fun chapterFromElement(element: Element): SChapter = SChapter.create().apply {
         scanlator = "Saikai Scan"
-        chapter_number = CHAPTER_REGEX.find(element.text())?.groupValues?.get(1)?.toFloatOrNull() ?: 1f
+        chapter_number = CHAPTER_REGEX.find(element.text())?.groupValues?.get(1)?.toFloatOrNull() ?: -1f
         name = element.text()
         url = element.attr("href")
     }
diff --git a/src/pt/supermangas/build.gradle b/src/pt/supermangas/build.gradle
index 3895c3c60..7ae0d1cdf 100644
--- a/src/pt/supermangas/build.gradle
+++ b/src/pt/supermangas/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Super Mangás'
     pkgNameSuffix = 'pt.supermangas'
     extClass = '.SuperMangasFactory'
-    extVersionCode = 3
+    extVersionCode = 4
     libVersion = '1.2'
     containsNsfw = true
 }
diff --git a/src/pt/supermangas/src/eu/kanade/tachiyomi/extension/pt/supermangas/SuperMangasGeneric.kt b/src/pt/supermangas/src/eu/kanade/tachiyomi/extension/pt/supermangas/SuperMangasGeneric.kt
index 905d4a70c..55f0c0f7c 100644
--- a/src/pt/supermangas/src/eu/kanade/tachiyomi/extension/pt/supermangas/SuperMangasGeneric.kt
+++ b/src/pt/supermangas/src/eu/kanade/tachiyomi/extension/pt/supermangas/SuperMangasGeneric.kt
@@ -290,7 +290,7 @@ abstract class SuperMangasGeneric(
 
     override fun chapterFromElement(element: Element): SChapter = SChapter.create().apply {
         name = element.select("a").first()!!.text()
-        chapter_number = element.select("span[style]").first()!!.text().toFloatOrNull() ?: 0f
+        chapter_number = element.select("span[style]").first()!!.text().toFloatOrNull() ?: -1f
         setUrlWithoutDomain(element.select("a").first()!!.attr("href"))
     }
 
diff --git a/src/pt/tsukimangas/build.gradle b/src/pt/tsukimangas/build.gradle
index bfa652852..82616a015 100644
--- a/src/pt/tsukimangas/build.gradle
+++ b/src/pt/tsukimangas/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Tsuki Mangás'
     pkgNameSuffix = 'pt.tsukimangas'
     extClass = '.TsukiMangas'
-    extVersionCode = 1
+    extVersionCode = 2
     libVersion = '1.2'
 }
 
diff --git a/src/pt/tsukimangas/src/eu/kanade/tachiyomi/extension/pt/tsukimangas/TsukiMangas.kt b/src/pt/tsukimangas/src/eu/kanade/tachiyomi/extension/pt/tsukimangas/TsukiMangas.kt
index fb4699fe6..8417bcc19 100644
--- a/src/pt/tsukimangas/src/eu/kanade/tachiyomi/extension/pt/tsukimangas/TsukiMangas.kt
+++ b/src/pt/tsukimangas/src/eu/kanade/tachiyomi/extension/pt/tsukimangas/TsukiMangas.kt
@@ -230,7 +230,7 @@ class TsukiMangas : HttpSource() {
     private fun chapterListItemParse(obj: JsonObject, slug: String): SChapter = SChapter.create().apply {
         name = "Cap. " + obj["NUMERO"].string +
             (if (obj["TITULO"].string.isNotEmpty()) " - " + obj["TITULO"].string else "")
-        chapter_number = obj["NUMERO"].string.toFloatOrNull() ?: 0f
+        chapter_number = obj["NUMERO"].string.toFloatOrNull() ?: -1f
         scanlator = obj["scans"].array.joinToString { it.obj["NOME"].string }
         date_upload = DATE_FORMATTER.tryParseDate(obj["DATA"].string.substringBefore("T"))
         url = "/leitor/$slug/" + obj["NUMERO"].string
diff --git a/src/pt/yesmangas/build.gradle b/src/pt/yesmangas/build.gradle
index 4a6e0ad90..ff75ebb96 100644
--- a/src/pt/yesmangas/build.gradle
+++ b/src/pt/yesmangas/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'YES Mangás'
     pkgNameSuffix = 'pt.yesmangas'
     extClass = '.YesMangas'
-    extVersionCode = 5
+    extVersionCode = 6
     libVersion = '1.2'
 }
 
diff --git a/src/pt/yesmangas/src/eu/kanade/tachiyomi/extension/pt/yesmangas/YesMangas.kt b/src/pt/yesmangas/src/eu/kanade/tachiyomi/extension/pt/yesmangas/YesMangas.kt
index 372447c37..116236397 100644
--- a/src/pt/yesmangas/src/eu/kanade/tachiyomi/extension/pt/yesmangas/YesMangas.kt
+++ b/src/pt/yesmangas/src/eu/kanade/tachiyomi/extension/pt/yesmangas/YesMangas.kt
@@ -90,7 +90,7 @@ class YesMangas : ParsedHttpSource() {
 
     override fun chapterFromElement(element: Element): SChapter = SChapter.create().apply {
         name = element.attr("title").substringAfter(" - ")
-        chapter_number = element.text().toFloatOrNull() ?: 1f
+        chapter_number = element.text().toFloatOrNull() ?: -1f
         setUrlWithoutDomain(element.attr("href"))
     }
 
diff --git a/src/ru/henchan/build.gradle b/src/ru/henchan/build.gradle
index 43c894367..182942a7e 100644
--- a/src/ru/henchan/build.gradle
+++ b/src/ru/henchan/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'Henchan'
     pkgNameSuffix = 'ru.henchan'
     extClass = '.Henchan'
-    extVersionCode = 19
+    extVersionCode = 20
     libVersion = '1.2'
     containsNsfw = true
 }
diff --git a/src/ru/henchan/src/eu/kanade/tachiyomi/extension/ru/henchan/Henchan.kt b/src/ru/henchan/src/eu/kanade/tachiyomi/extension/ru/henchan/Henchan.kt
index 59534087f..e81b55ac6 100644
--- a/src/ru/henchan/src/eu/kanade/tachiyomi/extension/ru/henchan/Henchan.kt
+++ b/src/ru/henchan/src/eu/kanade/tachiyomi/extension/ru/henchan/Henchan.kt
@@ -240,7 +240,7 @@ class Henchan : ParsedHttpSource() {
         chapter.setUrlWithoutDomain(element.select("h2 a").attr("href"))
         val chapterName = element.select("h2 a").attr("title")
         chapter.name = chapterName
-        chapter.chapter_number = "(глава\\s|часть\\s)(\\d+)".toRegex(RegexOption.IGNORE_CASE).find(chapterName)?.groupValues?.get(2)?.toFloat() ?: 0F
+        chapter.chapter_number = "(глава\\s|часть\\s)(\\d+)".toRegex(RegexOption.IGNORE_CASE).find(chapterName)?.groupValues?.get(2)?.toFloat() ?: -1F
         chapter.date_upload = Date().time // setting to current date because of a sorting in the "Recent updates" section
         return chapter
     }
diff --git a/src/zh/manhuagui/build.gradle b/src/zh/manhuagui/build.gradle
index b0acc7964..20f0ce3d2 100644
--- a/src/zh/manhuagui/build.gradle
+++ b/src/zh/manhuagui/build.gradle
@@ -5,7 +5,7 @@ ext {
     extName = 'ManHuaGui'
     pkgNameSuffix = 'zh.manhuagui'
     extClass = '.Manhuagui'
-    extVersionCode = 5
+    extVersionCode = 6
     libVersion = '1.2'
 }
 
diff --git a/src/zh/manhuagui/src/eu/kanade/tachiyomi/extension/zh/manhuagui/Manhuagui.kt b/src/zh/manhuagui/src/eu/kanade/tachiyomi/extension/zh/manhuagui/Manhuagui.kt
index 632eb8c28..114373060 100644
--- a/src/zh/manhuagui/src/eu/kanade/tachiyomi/extension/zh/manhuagui/Manhuagui.kt
+++ b/src/zh/manhuagui/src/eu/kanade/tachiyomi/extension/zh/manhuagui/Manhuagui.kt
@@ -246,7 +246,7 @@ class Manhuagui : ConfigurableSource, ParsedHttpSource() {
             val currentChapter = SChapter.create()
             currentChapter.url = it.attr("href")
             currentChapter.name = it?.attr("title")?.trim() ?: it.select("span").first().ownText()
-            currentChapter.chapter_number = chNumRegex.find(currentChapter.name)?.value?.toFloatOrNull() ?: 0F
+            currentChapter.chapter_number = chNumRegex.find(currentChapter.name)?.value?.toFloatOrNull() ?: -1F
 
             // Manhuagui only provide upload date for latest chapter
             if (currentChapter.url == latestChapterHref) {