Prevent crash

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

@@ -24,6 +24,7 @@ import android.view.MenuItem;
 
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 
 public class ActivityCompose extends ActivityBase implements FragmentManager.OnBackStackChangedListener {
     static final int REQUEST_CONTACT_TO = 1;
@@ -54,7 +55,8 @@ public class ActivityCompose extends ActivityBase implements FragmentManager.OnB
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
-                getSupportFragmentManager().popBackStack();
+                if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                    getSupportFragmentManager().popBackStack();
                 return true;
         }
         return super.onOptionsItemSelected(item);

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

@@ -30,6 +30,7 @@ import java.util.List;
 
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 
@@ -83,7 +84,8 @@ public class ActivitySetup extends ActivityBase implements FragmentManager.OnBac
     public boolean onOptionsItemSelected(MenuItem item) {
         switch (item.getItemId()) {
             case android.R.id.home:
-                getSupportFragmentManager().popBackStack();
+                if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                    getSupportFragmentManager().popBackStack();
                 return true;
         }
         return super.onOptionsItemSelected(item);

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

@@ -59,6 +59,7 @@ import androidx.appcompat.app.ActionBarDrawerToggle;
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.fragment.app.FragmentManager;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.localbroadcastmanager.content.LocalBroadcastManager;
 
@@ -347,7 +348,8 @@ public class ActivityView extends ActivityBase implements FragmentManager.OnBack
 
         switch (item.getItemId()) {
             case android.R.id.home:
-                getSupportFragmentManager().popBackStack();
+                if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.RESUMED))
+                    getSupportFragmentManager().popBackStack();
                 return true;
             default:
                 return false;