diff --git a/app/src/main/java/eu/kanade/tachiyomi/AppModule.kt b/app/src/main/java/eu/kanade/tachiyomi/AppModule.kt
index 2ffbaf148..2f3ec7a71 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/AppModule.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/AppModule.kt
@@ -42,13 +42,13 @@ class AppModule(val app: Application) : InjektModule {
 
         addSingletonFactory { DownloadManager(app) }
 
-        addSingletonFactory { CustomMangaManager(app) }
-
         addSingletonFactory { TrackManager(app) }
 
         addSingletonFactory { Gson() }
 
         // SY -->
+        addSingletonFactory { CustomMangaManager(app) }
+
         addSingletonFactory { EHentaiUpdateHelper(app) }
         // SY <--
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/library/CustomMangaManager.kt b/app/src/main/java/eu/kanade/tachiyomi/data/library/CustomMangaManager.kt
index 1b3384c0f..b033b190a 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/library/CustomMangaManager.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/library/CustomMangaManager.kt
@@ -7,13 +7,6 @@ import kotlinx.serialization.Serializable
 import kotlinx.serialization.decodeFromString
 import kotlinx.serialization.encodeToString
 import kotlinx.serialization.json.Json
-import kotlinx.serialization.json.JsonArray
-import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.json.buildJsonObject
-import kotlinx.serialization.json.contentOrNull
-import kotlinx.serialization.json.encodeToJsonElement
-import kotlinx.serialization.json.jsonPrimitive
-import kotlinx.serialization.json.longOrNull
 import java.io.File
 import java.util.Scanner
 
@@ -33,25 +26,23 @@ class CustomMangaManager(val context: Context) {
         if (!editJson.exists() || !editJson.isFile) return
 
         val json = try {
-            Json.decodeFromString<JsonObject>(
+            Json.decodeFromString<MangaList>(
                 Scanner(editJson).useDelimiter("\\Z").next()
             )
         } catch (e: Exception) {
             null
         } ?: return
 
-        val mangasJson = json["mangas"] as? JsonArray ?: return
-        customMangaMap = mangasJson.mapNotNull { element ->
-            val mangaObject = element as? JsonObject ?: return@mapNotNull null
-            val id = mangaObject["id"]?.jsonPrimitive?.longOrNull ?: return@mapNotNull null
+        val mangasJson = json.mangas ?: return
+        customMangaMap = mangasJson.mapNotNull { mangaJson ->
+            val id = mangaJson.id ?: return@mapNotNull null
             val manga = MangaImpl().apply {
                 this.id = id
-                title = mangaObject["title"]?.jsonPrimitive?.contentOrNull ?: ""
-                author = mangaObject["author"]?.jsonPrimitive?.contentOrNull
-                artist = mangaObject["artist"]?.jsonPrimitive?.contentOrNull
-                description = mangaObject["description"]?.jsonPrimitive?.contentOrNull
-                genre = (mangaObject["genre"] as? JsonArray)?.mapNotNull { it.jsonPrimitive.contentOrNull }
-                    ?.joinToString(", ")
+                title = mangaJson.title ?: ""
+                author = mangaJson.author
+                artist = mangaJson.artist
+                description = mangaJson.description
+                genre = mangaJson.genre?.joinToString(", ")
             }
             id to manga
         }.toMap().toMutableMap()
@@ -59,9 +50,9 @@ class CustomMangaManager(val context: Context) {
 
     fun saveMangaInfo(manga: MangaJson) {
         if (manga.title == null && manga.author == null && manga.artist == null && manga.description == null && manga.genre == null) {
-            customMangaMap.remove(manga.id)
+            customMangaMap.remove(manga.id!!)
         } else {
-            customMangaMap[manga.id] = MangaImpl().apply {
+            customMangaMap[manga.id!!] = MangaImpl().apply {
                 id = manga.id
                 title = manga.title ?: ""
                 author = manga.author
@@ -76,12 +67,8 @@ class CustomMangaManager(val context: Context) {
     private fun saveCustomInfo() {
         val jsonElements = customMangaMap.values.map { it.toJson() }
         if (jsonElements.isNotEmpty()) {
-            val mangaEntries = Json.encodeToJsonElement(jsonElements)
-            val root = buildJsonObject {
-                put("mangas", mangaEntries)
-            }
             editJson.delete()
-            editJson.writeText(Json.encodeToString(root))
+            editJson.writeText(Json.encodeToString(MangaList(jsonElements)))
         }
     }
 
@@ -92,18 +79,23 @@ class CustomMangaManager(val context: Context) {
             author,
             artist,
             description,
-            genre?.split(", ")?.toTypedArray()
+            genre?.split(", ")
         )
     }
 
+    @Serializable
+    data class MangaList(
+        val mangas: List<MangaJson>? = null
+    )
+
     @Serializable
     data class MangaJson(
-        val id: Long,
+        val id: Long? = null,
         val title: String? = null,
         val author: String? = null,
         val artist: String? = null,
         val description: String? = null,
-        val genre: Array<String>? = null
+        val genre: List<String>? = null
     ) {
 
         override fun equals(other: Any?): Boolean {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
index 08fbb9692..ed809b548 100755
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryPresenter.kt
@@ -529,7 +529,7 @@ class LibraryPresenter(
                     (if (manga.author != manga.originalAuthor) manga.author else null),
                     (if (manga.artist != manga.originalArtist) manga.artist else null),
                     (if (manga.description != manga.originalDescription) manga.description else null),
-                    (if (manga.genre != manga.originalGenre) manga.getGenres()?.toTypedArray() else null)
+                    (if (manga.genre != manga.originalGenre) manga.getGenres() else null)
                 )
             }
             mangaJson?.let {
diff --git a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt
index 4094593e3..06fe4a5d8 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/ui/manga/MangaPresenter.kt
@@ -295,7 +295,7 @@ class MangaPresenter(
             db.updateMangaInfo(manga).executeAsBlocking()
         } else {
             val genre = if (!tags.isNullOrEmpty() && tags.joinToString() != manga.genre) {
-                tags.toTypedArray()
+                tags
             } else {
                 null
             }