diff --git a/android/src/main/java/de/x4fyr/paiman/app/utils.kt b/android/src/main/java/de/x4fyr/paiman/app/utils.kt
index 9f4d015..4da5635 100644
--- a/android/src/main/java/de/x4fyr/paiman/app/utils.kt
+++ b/android/src/main/java/de/x4fyr/paiman/app/utils.kt
@@ -12,6 +12,8 @@ import android.view.MenuItem
 import android.view.View
 import de.x4fyr.paiman.R
 import de.x4fyr.paiman.lib.adapter.AndroidGoogleDriveStorageAdapter
+import kotlinx.coroutines.experimental.android.UI
+import kotlinx.coroutines.experimental.launch
 import java.io.File
 import java.io.InputStream
 import javax.inject.Inject
@@ -101,10 +103,12 @@ suspend fun Activity.getInputStreamFromUrl(url: String): InputStream? {
 
 /** Error [AlertDialog] */
 fun Activity.errorDialog(msg: Int) {
-    AlertDialog.Builder(this)
-            .setMessage(msg)
-            .create()
-            .show()
+    launch(UI) {
+        AlertDialog.Builder(this@errorDialog)
+                .setMessage(msg)
+                .create()
+                .show()
+    }
 }
 
 /**