From 88dd449ac6edc975b102e1ae40ceabd5032576f4 Mon Sep 17 00:00:00 2001
From: Vishesh Handa <me@vhanda.in>
Date: Sun, 18 Oct 2020 10:06:03 +0200
Subject: [PATCH] Graph: Avoid calling a method on null

Fixes APP-DX
---
 lib/core/graph.dart | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/core/graph.dart b/lib/core/graph.dart
index 9e3e97f0..8cf40dec 100644
--- a/lib/core/graph.dart
+++ b/lib/core/graph.dart
@@ -188,8 +188,10 @@ class Graph extends ChangeNotifier {
   }
 
   void stopLayout() {
-    layoutTimer.cancel();
-    layoutTimer = null;
+    if (layoutTimer != null) {
+      layoutTimer.cancel();
+      layoutTimer = null;
+    }
   }
 }