From b6c3db70ac61fc69acb4edcc22e688ba5f5a7917 Mon Sep 17 00:00:00 2001
From: Logan Williams <logan.williams@alum.mit.edu>
Date: Wed, 11 Jan 2023 11:32:40 +0100
Subject: [PATCH] Check to see if screenfull is initialized (#62)

Co-authored-by: Miguel Sozinho Ramalho <19508417+msramalho@users.noreply.github.com>
---
 src/components/controls/FullScreenToggle.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/components/controls/FullScreenToggle.js b/src/components/controls/FullScreenToggle.js
index 1df02eb..890b48c 100644
--- a/src/components/controls/FullScreenToggle.js
+++ b/src/components/controls/FullScreenToggle.js
@@ -15,11 +15,11 @@ export class FullscreenToggle extends React.Component {
   }
 
   componentDidMount() {
-    screenfull.on("change", this.onFullscreenStateChange);
+    if (screenfull.on) screenfull.on("change", this.onFullscreenStateChange);
   }
 
   componentWillUnmount() {
-    screenfull.off("change", this.onFullscreenStateChange);
+    if (screenfull.off) screenfull.off("change", this.onFullscreenStateChange);
   }
 
   onFullscreenStateChange(evt) {