Prevent crash

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -708,7 +708,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     }
 
     private void onMenuFolders(long account) {
-        getSupportFragmentManager().popBackStack("unified", 0);
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+            getSupportFragmentManager().popBackStack("unified", 0);
 
         Bundle args = new Bundle();
         args.putLong("account", account);
@@ -790,7 +791,9 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     }
 
     private void onShowLog() {
-        getSupportFragmentManager().popBackStack("logs", FragmentManager.POP_BACK_STACK_INCLUSIVE);
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+            getSupportFragmentManager().popBackStack("logs", FragmentManager.POP_BACK_STACK_INCLUSIVE);
+
         FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
         fragmentTransaction.replace(R.id.content_frame, new FragmentLogs()).addToBackStack("logs");
         fragmentTransaction.commit();
@@ -1081,7 +1084,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     }
 
     private void onViewThread(Intent intent) {
-        getSupportFragmentManager().popBackStack("thread", FragmentManager.POP_BACK_STACK_INCLUSIVE);
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+            getSupportFragmentManager().popBackStack("thread", FragmentManager.POP_BACK_STACK_INCLUSIVE);
 
         Bundle args = new Bundle();
         args.putLong("account", intent.getLongExtra("account", -1));

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -1135,7 +1135,8 @@ public class FragmentMessages extends FragmentEx {
     }
 
     private void onMenuFolders() {
-        getFragmentManager().popBackStack("unified", 0);
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+            getFragmentManager().popBackStack("unified", 0);
 
         Bundle args = new Bundle();
         args.putLong("account", primary);