diff --git a/app/src/main/java/de/sebse/fuplanner/services/newkvv/UserLoginTask.java b/app/src/main/java/de/sebse/fuplanner/services/newkvv/UserLoginTask.java
index 8aa3c65..02d5721 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/newkvv/UserLoginTask.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/newkvv/UserLoginTask.java
@@ -86,6 +86,10 @@ public class UserLoginTask extends AsyncTask<Void, Void, String> {
 
     @Override
     protected void onCancelled() {
+        if (mActivity == null || mActivity.isFinishing())
+            return;
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 && mActivity.isDestroyed())
+            return;
         mActivity.mAuthTask = null;
         mActivity.showProgress(false);
     }