diff --git a/src/en/mangasee/build.gradle b/src/en/mangasee/build.gradle
index 1abc203a5..1e264936b 100644
--- a/src/en/mangasee/build.gradle
+++ b/src/en/mangasee/build.gradle
@@ -5,7 +5,7 @@ ext {
     appName = 'Tachiyomi: Mangasee'
     pkgNameSuffix = 'en.mangasee'
     extClass = '.Mangasee'
-    extVersionCode = 5
+    extVersionCode = 6
     libVersion = '1.2'
 }
 
diff --git a/src/en/mangasee/src/eu/kanade/tachiyomi/extension/en/mangasee/Mangasee.kt b/src/en/mangasee/src/eu/kanade/tachiyomi/extension/en/mangasee/Mangasee.kt
index 9d9619473..1a85309e5 100644
--- a/src/en/mangasee/src/eu/kanade/tachiyomi/extension/en/mangasee/Mangasee.kt
+++ b/src/en/mangasee/src/eu/kanade/tachiyomi/extension/en/mangasee/Mangasee.kt
@@ -14,6 +14,7 @@ import org.jsoup.nodes.Document
 import org.jsoup.nodes.Element
 import java.text.SimpleDateFormat
 import java.util.regex.Pattern
+import java.util.Locale
 
 class Mangasee : ParsedHttpSource() {
 
@@ -44,6 +45,7 @@ class Mangasee : ParsedHttpSource() {
             manga.setUrlWithoutDomain(it.attr("href"))
             manga.title = it.text()
         }
+        manga.thumbnail_url = element.select("img").attr("abs:src")
         return manga
     }
 
@@ -65,7 +67,7 @@ class Mangasee : ParsedHttpSource() {
                         url.addQueryParameter("sortOrder", "descending")
                 }
                 is SelectField -> if (filter.state != 0) url.addQueryParameter(filter.key, filter.values[filter.state])
-                is TextField -> if (!filter.state.isEmpty()) url.addQueryParameter(filter.key, filter.state)
+                is TextField -> if (filter.state.isNotEmpty()) url.addQueryParameter(filter.key, filter.state)
                 is GenreList -> filter.state.forEach { genre ->
                     when (genre.state) {
                         Filter.TriState.STATE_INCLUDE -> genres.add(genre.name)
@@ -81,8 +83,8 @@ class Mangasee : ParsedHttpSource() {
         return POST(requestUrl, headers, body.build())
     }
 
-    private fun convertQueryToPost(page: Int, url: String): Pair<FormBody.Builder, String> {
-        val url = HttpUrl.parse(url)!!
+    private fun convertQueryToPost(page: Int, urlString: String): Pair<FormBody.Builder, String> {
+        val url = HttpUrl.parse(urlString)!!
         val body = FormBody.Builder().add("page", page.toString())
         for (i in 0 until url.querySize()) {
             body.add(url.queryParameterName(i), url.queryParameterValue(i))
@@ -97,6 +99,7 @@ class Mangasee : ParsedHttpSource() {
             manga.setUrlWithoutDomain(it.attr("href"))
             manga.title = it.text()
         }
+        manga.thumbnail_url = element.select("img").attr("abs:src")
         return manga
     }
 
@@ -107,7 +110,7 @@ class Mangasee : ParsedHttpSource() {
 
         val manga = SManga.create()
         manga.author = detailElement.select("a[href^=/search/?author=]").first()?.text()
-        manga.genre = detailElement.select("span.details > div.row > div:has(b:contains(Genre(s))) > a").map { it.text() }.joinToString()
+        manga.genre = detailElement.select("span.details > div.row > div:has(b:contains(Genre(s))) > a").joinToString { it.text() }
         manga.description = detailElement.select("strong:contains(Description:) + div").first()?.text()
         manga.status = detailElement.select("a[href^=/search/?status=]").first()?.text().orEmpty().let { parseStatus(it) }
         manga.thumbnail_url = detailElement.select("div > img").first()?.absUrl("src")
@@ -127,13 +130,13 @@ class Mangasee : ParsedHttpSource() {
 
         val chapter = SChapter.create()
         chapter.setUrlWithoutDomain(urlElement.attr("href"))
-        chapter.name = element.select("span.chapterLabel").first().text()?.let { it } ?: ""
+        chapter.name = element.select("span.chapterLabel").firstOrNull()?.text() ?: ""
         chapter.date_upload = element.select("time").first()?.attr("datetime")?.let { parseChapterDate(it) } ?: 0
         return chapter
     }
 
     private fun parseChapterDate(dateAsString: String): Long {
-        return SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ").parse(dateAsString).time
+        return SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ", Locale.US).parse(dateAsString).time
     }
 
     override fun pageListParse(document: Document): List<Page> {
@@ -152,7 +155,7 @@ class Mangasee : ParsedHttpSource() {
             index = "-index-$indexNumber"
         }
 
-        document.select("div.ContainerNav").first().select("select.PageSelect > option").forEach {
+        document.select("div.ContainerNav").first().select("select.PageSelect > option").forEach { _ ->
             pages.add(Page(pages.size, "$url/$series-chapter-$chapter$index-page-${pages.size + 1}.html"))
         }
         pages.getOrNull(0)?.imageUrl = imageUrlParse(document)
@@ -184,10 +187,11 @@ class Mangasee : ParsedHttpSource() {
             manga.setUrlWithoutDomain("/manga$mangaUrl")
             manga.title = title
         }
+        manga.thumbnail_url = element.select("img").attr("abs:src")
         return manga
     }
 
-    private class Sort : Filter.Sort("Sort", arrayOf("Alphabetically", "Date updated", "Popularity"), Filter.Sort.Selection(2, false))
+    private class Sort : Filter.Sort("Sort", arrayOf("Alphabetically", "Date updated", "Popularity"), Selection(2, false))
     private class Genre(name: String) : Filter.TriState(name)
     private class TextField(name: String, val key: String) : Filter.Text(name)
     private class SelectField(name: String, val key: String, values: Array<String>, state: Int = 0) : Filter.Select<String>(name, values, state)