diff --git a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
index f18d0732..d1941375 100644
--- a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
+++ b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/backup/proto/ProtoBackupImport.kt
@@ -33,6 +33,7 @@ import org.jetbrains.exposed.sql.update
 import suwayomi.tachidesk.graphql.types.toStatus
 import suwayomi.tachidesk.manga.impl.Category
 import suwayomi.tachidesk.manga.impl.CategoryManga
+import suwayomi.tachidesk.manga.impl.Manga.clearThumbnail
 import suwayomi.tachidesk.manga.impl.backup.models.Chapter
 import suwayomi.tachidesk.manga.impl.backup.models.Manga
 import suwayomi.tachidesk.manga.impl.backup.proto.ProtoBackupValidator.ValidationResult
@@ -314,6 +315,9 @@ object ProtoBackupImport : ProtoBackupBase() {
                         dbMangaId
                     }
 
+                // delete thumbnail in case cached data still exists
+                clearThumbnail(mangaId)
+
                 // merge chapter data
                 restoreMangaChapterData(mangaId, restoreMode, chapters)