diff --git a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/Extension.kt b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/Extension.kt
index c53d0ef0..567728be 100644
--- a/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/Extension.kt
+++ b/server/src/main/kotlin/suwayomi/tachidesk/manga/impl/extension/Extension.kt
@@ -240,7 +240,7 @@ object Extension {
         ZipInputStream(apkFile.inputStream()).use { zipInputStream ->
             var zipEntry = zipInputStream.nextEntry
             while (zipEntry != null) {
-                if (zipEntry.name.startsWith("assets/")) {
+                if (zipEntry.name.startsWith("assets/") && !zipEntry.isDirectory) {
                     val assetFile = File(assetsFolder, zipEntry.name)
                     assetFile.parentFile.mkdirs()
                     FileOutputStream(assetFile).use { outputStream ->