Prevent crash

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

@@ -1288,7 +1288,7 @@ public class FragmentCompose extends FragmentBase {
 
                 @Override
                 protected void onExecuted(final Bundle args, EntityIdentity identity) {
-                    Helper.selectKeyAlias(getActivity(), identity.sign_key_alias, new Helper.IKeyAlias() {
+                    Helper.selectKeyAlias(getActivity(), getViewLifecycleOwner(), identity.sign_key_alias, new Helper.IKeyAlias() {
                         @Override
                         public void onSelected(String alias) {
                             args.putString("alias", alias);

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

@@ -4062,7 +4062,8 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     if (auto && identity == null)
                         return;
 
-                    Helper.selectKeyAlias(getActivity(), identity == null ? null : identity.sign_key_alias, new Helper.IKeyAlias() {
+                    String alias = (identity == null ? null : identity.sign_key_alias);
+                    Helper.selectKeyAlias(getActivity(), getViewLifecycleOwner(), alias, new Helper.IKeyAlias() {
                         @Override
                         public void onSelected(String alias) {
                             args.putString("alias", alias);

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

@@ -80,6 +80,8 @@ import androidx.constraintlayout.widget.ConstraintLayout;
 import androidx.core.content.ContextCompat;
 import androidx.core.graphics.ColorUtils;
 import androidx.fragment.app.FragmentActivity;
+import androidx.lifecycle.Lifecycle;
+import androidx.lifecycle.LifecycleOwner;
 import androidx.preference.PreferenceManager;
 import androidx.recyclerview.widget.RecyclerView;
 
@@ -845,7 +847,7 @@ public class Helper {
         prefs.edit().remove("last_authentication").apply();
     }
 
-    static void selectKeyAlias(final Activity activity, final String email, final IKeyAlias intf) {
+    static void selectKeyAlias(final Activity activity, final LifecycleOwner owner, final String email, final IKeyAlias intf) {
         final Context context = activity.getApplicationContext();
         final Handler handler = new Handler();
 
@@ -859,6 +861,7 @@ public class Helper {
                             handler.post(new Runnable() {
                                 @Override
                                 public void run() {
+                                    if (owner.getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
                                         intf.onSelected(email);
                                 }
                             });
@@ -880,6 +883,7 @@ public class Helper {
                                         handler.post(new Runnable() {
                                             @Override
                                             public void run() {
+                                                if (owner.getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
                                                     if (alias == null)
                                                         intf.onNothingSelected();
                                                     else