Prevent crash

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

@@ -109,6 +109,7 @@ public class ActivitySetup extends ActivityBilling implements FragmentManager.On
 
     static final String ACTION_EDIT_ACCOUNT = BuildConfig.APPLICATION_ID + ".EDIT_ACCOUNT";
     static final String ACTION_EDIT_IDENTITY = BuildConfig.APPLICATION_ID + ".EDIT_IDENTITY";
+    static final String ACTION_SHOW_PRO = BuildConfig.APPLICATION_ID + ".SHOW_PRO";
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -302,6 +303,7 @@ public class ActivitySetup extends ActivityBilling implements FragmentManager.On
         IntentFilter iff = new IntentFilter();
         iff.addAction(ACTION_EDIT_ACCOUNT);
         iff.addAction(ACTION_EDIT_IDENTITY);
+        iff.addAction(ACTION_SHOW_PRO);
         lbm.registerReceiver(receiver, iff);
     }
 
@@ -906,6 +908,15 @@ public class ActivitySetup extends ActivityBilling implements FragmentManager.On
         fragmentTransaction.commit();
     }
 
+    private void onShowPro(Intent intent) {
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+            getSupportFragmentManager().popBackStack("pro", FragmentManager.POP_BACK_STACK_INCLUSIVE);
+
+        FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
+        fragmentTransaction.commit();
+    }
+
     BroadcastReceiver receiver = new BroadcastReceiver() {
         @Override
         public void onReceive(Context context, Intent intent) {
@@ -913,6 +924,8 @@ public class ActivitySetup extends ActivityBilling implements FragmentManager.On
                 onEditAccount(intent);
             else if (ACTION_EDIT_IDENTITY.equals(intent.getAction()))
                 onEditIdentity(intent);
+            else if (ACTION_SHOW_PRO.equals(intent.getAction()))
+                onShowPro(intent);
         }
     };
 }

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

@@ -22,6 +22,7 @@ package eu.faircode.email;
 import android.app.Dialog;
 import android.app.TimePickerDialog;
 import android.content.Context;
+import android.content.Intent;
 import android.content.SharedPreferences;
 import android.os.Bundle;
 import android.text.format.DateFormat;
@@ -38,7 +39,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.appcompat.widget.SwitchCompat;
 import androidx.fragment.app.DialogFragment;
-import androidx.fragment.app.FragmentTransaction;
+import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 import androidx.preference.PreferenceManager;
 
 import java.text.SimpleDateFormat;
@@ -116,9 +117,8 @@ public class FragmentOptionsGeneral extends FragmentBase implements SharedPrefer
                         ServiceSynchronize.reschedule(getContext());
                     } else {
                         swSchedule.setChecked(false);
-                        FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
-                        fragmentTransaction.replace(R.id.content_frame, new FragmentPro()).addToBackStack("pro");
-                        fragmentTransaction.commit();
+                        LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(getContext());
+                        lbm.sendBroadcast(new Intent(ActivityView.ACTION_SHOW_PRO));
                     }
                 } else {
                     prefs.edit().putBoolean("schedule", false).apply();