diff --git a/app/build.gradle b/app/build.gradle
index 24c2f33e..28714094 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -38,7 +38,7 @@ android {
         minSdkVersion 16
         targetSdkVersion 30
         versionCode 61
-        versionName "5.1.1-hotfix2"
+        versionName "5.1.1-hotfix3"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
         vectorDrawables.useSupportLibrary = true
     }
diff --git a/app/release/output-metadata.json b/app/release/output-metadata.json
index 14671273..5557886d 100644
--- a/app/release/output-metadata.json
+++ b/app/release/output-metadata.json
@@ -12,7 +12,7 @@
       "filters": [],
       "properties": [],
       "versionCode": 61,
-      "versionName": "5.1.1-hotfix2",
+      "versionName": "5.1.1-hotfix3",
       "enabled": true,
       "outputFile": "app-release.apk"
     }
diff --git a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
index 246fdf36..c95849af 100644
--- a/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
+++ b/app/src/main/java/xyz/quaver/pupil/adapters/GalleryBlockAdapter.kt
@@ -20,7 +20,6 @@ package xyz.quaver.pupil.adapters
 
 import android.content.Context
 import android.graphics.drawable.Drawable
-import android.net.Uri
 import android.util.SparseBooleanArray
 import android.view.LayoutInflater
 import android.view.View
@@ -36,7 +35,6 @@ import com.daimajia.swipe.adapters.RecyclerSwipeAdapter
 import com.daimajia.swipe.interfaces.SwipeAdapterInterface
 import com.github.piasy.biv.loader.ImageLoader
 import kotlinx.android.synthetic.main.item_galleryblock.view.*
-import kotlinx.android.synthetic.main.item_reader.view.*
 import kotlinx.coroutines.*
 import xyz.quaver.hitomi.getReader
 import xyz.quaver.io.util.getChild
@@ -158,7 +156,9 @@ class GalleryBlockAdapter(private val galleries: List<Int>) : RecyclerSwipeAdapt
                     })
                     ssiv?.recycle()
                     CoroutineScope(Dispatchers.IO).launch {
-                        showImage(cache.getThumbnail() ?: Uri.EMPTY)
+                        cache.getThumbnail().let { launch(Dispatchers.Main) {
+                            showImage(it)
+                        } }
                     }
                 }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
index ffcfc76d..cb586e3c 100644
--- a/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
+++ b/app/src/main/java/xyz/quaver/pupil/ui/MainActivity.kt
@@ -122,6 +122,8 @@ class MainActivity :
 
         checkUpdate(this)
 
+
+
         initView()
     }
 
diff --git a/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt b/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
index 9205f87b..f2e4cc70 100644
--- a/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
+++ b/app/src/main/java/xyz/quaver/pupil/util/downloader/Cache.kt
@@ -132,7 +132,7 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
     }
 
     @Suppress("BlockingMethodInNonBlockingContext")
-    suspend fun getThumbnail(): Uri? =
+    suspend fun getThumbnail(): Uri =
         findFile(".thumbnail")?.uri
             ?: getGalleryBlock()?.thumbnails?.firstOrNull()?.let { withContext(Dispatchers.IO) {
                 kotlin.runCatching {
@@ -144,7 +144,7 @@ class Cache private constructor(context: Context, val galleryID: Int) : ContextW
                 }.getOrNull()?.let { thumbnail -> kotlin.runCatching {
                     cacheFolder.getChild(".thumbnail").also { it.writeBytes(thumbnail) }
                 }.getOrNull()?.uri }
-            } }
+            } } ?: Uri.EMPTY
 
     suspend fun getReader(): Reader? {
         val mirrors = Preferences.get<String>("mirrors").let { if (it.isEmpty()) emptyList() else it.split('>') }
diff --git a/app/src/main/res/values-ko/strings.xml b/app/src/main/res/values-ko/strings.xml
index 3c4522be..2331da30 100644
--- a/app/src/main/res/values-ko/strings.xml
+++ b/app/src/main/res/values-ko/strings.xml
@@ -12,7 +12,7 @@
     <string name="settings_galleries_per_page">한 번에 로드할 갤러리 수</string>
     <string name="settings_search_title">검색 설정</string>
     <string name="settings_title">설정</string>
-    <string name="update_notification_description">apk 다운로드중&#8230;</string>
+    <string name="update_notification_description">업데이트 다운로드중&#8230;</string>
     <string name="update_title">업데이트가 있습니다!</string>
     <string name="warning">경고</string>
     <string name="main_no_result">결과 없음</string>