From cb0eef9edd3bcc600ce350e8a75c1c0b5fd14932 Mon Sep 17 00:00:00 2001
From: yanas <yana@jitsi.org>
Date: Thu, 6 Apr 2017 13:25:11 -0500
Subject: [PATCH] Fix(SideContainerToggler.js): Check if the component exists
 on init

---
 .../UI/side_pannels/SideContainerToggler.js   | 24 +++++++++++++------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/modules/UI/side_pannels/SideContainerToggler.js b/modules/UI/side_pannels/SideContainerToggler.js
index 763d07d41..b845a59e5 100644
--- a/modules/UI/side_pannels/SideContainerToggler.js
+++ b/modules/UI/side_pannels/SideContainerToggler.js
@@ -16,17 +16,27 @@ const SideContainerToggler = {
     init(eventEmitter) {
         this.eventEmitter = eventEmitter;
 
-        // Adds a listener for the animation end event that would take care
-        // of hiding all internal containers when the extendedToolbarPanel is
+        // We may not have a side toolbar container, for example, in
+        // filmstrip-only mode.
+        const sideToolbarContainer
+            = document.getElementById("sideToolbarContainer");
+
+        if (!sideToolbarContainer)
+            return;
+
+        // Adds a listener for the animationend event that would take care of
+        // hiding all internal containers when the extendedToolbarPanel is
         // closed.
-        document.getElementById("sideToolbarContainer")
-            .addEventListener("animationend", function(e) {
-                if(e.animationName === "slideOutExt")
+        sideToolbarContainer.addEventListener(
+            "animationend",
+            function(e) {
+                if (e.animationName === "slideOutExt")
                     $("#sideToolbarContainer").children().each(function() {
                         if ($(this).hasClass("show"))
                             SideContainerToggler.hideInnerContainer($(this));
                     });
-            }, false);
+            },
+            false);
     },
 
     /**
@@ -134,4 +144,4 @@ const SideContainerToggler = {
     }
 };
 
-export default SideContainerToggler;
\ No newline at end of file
+export default SideContainerToggler;