From 607f3373eadb4902608479e72a34846489a3f3c6 Mon Sep 17 00:00:00 2001
From: M66B <M66B@users.noreply.github.com>
Date: Fri, 25 Jan 2019 06:48:46 +0000
Subject: [PATCH] Prevent crash

---
 .../main/java/eu/faircode/email/FragmentMessages.java    | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/app/src/main/java/eu/faircode/email/FragmentMessages.java b/app/src/main/java/eu/faircode/email/FragmentMessages.java
index 4dbea83078..2f3c7eba34 100644
--- a/app/src/main/java/eu/faircode/email/FragmentMessages.java
+++ b/app/src/main/java/eu/faircode/email/FragmentMessages.java
@@ -295,12 +295,15 @@ public class FragmentMessages extends FragmentBase {
             selectionTracker.addObserver(new SelectionTracker.SelectionObserver() {
                 @Override
                 public void onSelectionChanged() {
-                    // Workaround AndroidX bug
+                    SelectionTracker tracker = selectionTracker;
+                    if (tracker == null)
+                        return;
+
                     FragmentActivity activity = getActivity();
                     if (activity != null) {
                         try {
                             ViewModelMessages modelMessages = ViewModelProviders.of(activity).get(ViewModelMessages.class);
-                            if (selectionTracker.hasSelection())
+                            if (tracker.hasSelection())
                                 modelMessages.removeObservers(viewType, getViewLifecycleOwner());
                             else
                                 modelMessages.observe(viewType, getViewLifecycleOwner(), observer);
@@ -312,7 +315,7 @@ public class FragmentMessages extends FragmentBase {
                         activity.invalidateOptionsMenu();
                     }
 
-                    if (selectionTracker.hasSelection()) {
+                    if (tracker.hasSelection()) {
                         swipeRefresh.setEnabled(false);
                         fabMore.show();
                     } else {