diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt
index b775f595b..367614487 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/BackupManager.kt
@@ -3,8 +3,10 @@ package eu.kanade.tachiyomi.data.backup
 import com.github.salomonbrys.kotson.fromJson
 import com.google.gson.*
 import com.google.gson.stream.JsonReader
+import eu.kanade.tachiyomi.data.backup.serializer.BooleanSerializer
 import eu.kanade.tachiyomi.data.backup.serializer.IdExclusion
 import eu.kanade.tachiyomi.data.backup.serializer.IntegerSerializer
+import eu.kanade.tachiyomi.data.backup.serializer.LongSerializer
 import eu.kanade.tachiyomi.data.database.DatabaseHelper
 import eu.kanade.tachiyomi.data.database.models.*
 import java.io.*
@@ -42,7 +44,9 @@ class BackupManager(private val db: DatabaseHelper) {
 
     @Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")
     private val gson = GsonBuilder()
-            .registerTypeAdapter(Integer::class.java, IntegerSerializer())
+            .registerTypeAdapter(java.lang.Integer::class.java, IntegerSerializer())
+            .registerTypeAdapter(java.lang.Boolean::class.java, BooleanSerializer())
+            .registerTypeAdapter(java.lang.Long::class.java, LongSerializer())
             .setExclusionStrategies(IdExclusion())
             .create()
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/BooleanSerializer.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/BooleanSerializer.kt
new file mode 100644
index 000000000..14d5a4236
--- /dev/null
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/BooleanSerializer.kt
@@ -0,0 +1,16 @@
+package eu.kanade.tachiyomi.data.backup.serializer
+
+import com.google.gson.JsonElement
+import com.google.gson.JsonPrimitive
+import com.google.gson.JsonSerializationContext
+import com.google.gson.JsonSerializer
+import java.lang.reflect.Type
+
+class BooleanSerializer : JsonSerializer<Boolean> {
+
+    override fun serialize(value: Boolean?, type: Type, context: JsonSerializationContext): JsonElement? {
+        if (value != null && value != false)
+            return JsonPrimitive(value)
+        return null
+    }
+}
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/IdExclusion.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/IdExclusion.kt
index 867cb81b3..92c95cb03 100644
--- a/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/IdExclusion.kt
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/IdExclusion.kt
@@ -2,10 +2,10 @@ package eu.kanade.tachiyomi.data.backup.serializer
 
 import com.google.gson.ExclusionStrategy
 import com.google.gson.FieldAttributes
-import eu.kanade.tachiyomi.data.database.models.Category
-import eu.kanade.tachiyomi.data.database.models.Chapter
-import eu.kanade.tachiyomi.data.database.models.Manga
-import eu.kanade.tachiyomi.data.database.models.MangaSync
+import eu.kanade.tachiyomi.data.database.models.CategoryImpl
+import eu.kanade.tachiyomi.data.database.models.ChapterImpl
+import eu.kanade.tachiyomi.data.database.models.MangaImpl
+import eu.kanade.tachiyomi.data.database.models.MangaSyncImpl
 
 class IdExclusion : ExclusionStrategy {
 
@@ -15,10 +15,10 @@ class IdExclusion : ExclusionStrategy {
     private val syncExclusions = listOf("id", "manga_id", "update")
 
     override fun shouldSkipField(f: FieldAttributes) = when (f.declaringClass) {
-        Manga::class.java -> mangaExclusions.contains(f.name)
-        Chapter::class.java -> chapterExclusions.contains(f.name)
-        MangaSync::class.java -> syncExclusions.contains(f.name)
-        Category::class.java -> categoryExclusions.contains(f.name)
+        MangaImpl::class.java -> mangaExclusions.contains(f.name)
+        ChapterImpl::class.java -> chapterExclusions.contains(f.name)
+        MangaSyncImpl::class.java -> syncExclusions.contains(f.name)
+        CategoryImpl::class.java -> categoryExclusions.contains(f.name)
         else -> false
     }
 
diff --git a/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/LongSerializer.kt b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/LongSerializer.kt
new file mode 100644
index 000000000..be62e3fe1
--- /dev/null
+++ b/app/src/main/java/eu/kanade/tachiyomi/data/backup/serializer/LongSerializer.kt
@@ -0,0 +1,16 @@
+package eu.kanade.tachiyomi.data.backup.serializer
+
+import com.google.gson.JsonElement
+import com.google.gson.JsonPrimitive
+import com.google.gson.JsonSerializationContext
+import com.google.gson.JsonSerializer
+import java.lang.reflect.Type
+
+class LongSerializer : JsonSerializer<Long> {
+
+    override fun serialize(value: Long?, type: Type, context: JsonSerializationContext): JsonElement? {
+        if (value != null && value !== 0L)
+            return JsonPrimitive(value)
+        return null
+    }
+}