From 6e77f0ec58a6919f69418c31908168e4437adb75 Mon Sep 17 00:00:00 2001
From: Uwe Oestermeier <u.oestermeier@iwm-tuebingen.de>
Date: Wed, 10 Jul 2019 14:20:58 +0200
Subject: [PATCH] Added test for null in Timeline.onMove

---
 lib/pixi/timeline.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/pixi/timeline.js b/lib/pixi/timeline.js
index be4b1fe..4896091 100644
--- a/lib/pixi/timeline.js
+++ b/lib/pixi/timeline.js
@@ -781,6 +781,9 @@ export default class Timeline extends BitmapLabeledGraphics {
 
     onMove(event, interaction) {
         let delta = interaction.delta()
+        if (delta == null) {
+            return
+        }
         this.scroll += delta.x
         while (this.deltas.length > 10) {
             this.deltas.pop(0)