Fixed crash

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

@@ -40,6 +40,7 @@ import androidx.annotation.Nullable;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.constraintlayout.widget.Group;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.preference.PreferenceManager;
 import androidx.recyclerview.widget.DividerItemDecoration;
@@ -205,6 +206,8 @@ public class FragmentAccounts extends FragmentBase {
         animator.addUpdateListener(new ObjectAnimator.AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
+                if (!getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
+                    return;
                 fab.setAlpha((float) animation.getAnimatedValue());
             }
         });

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

@@ -32,6 +32,7 @@ import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.constraintlayout.widget.Group;
 import androidx.fragment.app.FragmentTransaction;
+import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.preference.PreferenceManager;
 import androidx.recyclerview.widget.DividerItemDecoration;
@@ -108,6 +109,8 @@ public class FragmentIdentities extends FragmentBase {
         animator.addUpdateListener(new ObjectAnimator.AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
+                if (!getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
+                    return;
                 fab.setAlpha((float) animation.getAnimatedValue());
             }
         });