fix exiting fullscreen throwing an error

Author: Armaldio

README.md

@@ -5,7 +5,7 @@ A plugin that integrate with Pipelab <br>
 Author: Armaldio <br>
 Website: https://github.com/CynToolkit/construct-plugin <br>
 Addon Url: https://github.com/CynToolkit/construct-plugin <br>
-Download Latest Version : [Version: 2.0.1](https://github.com/CynToolkit/construct-plugin/releases/latest) <br>
+Download Latest Version : [Version: 2.1.0](https://github.com/CynToolkit/construct-plugin/releases/latest) <br>
 <sub>Made using [c3ide2-framework](https://github.com/ConstructFund/c3ide2-framework) </sub><br>
 
 ## Table of Contents

src/instance.js

@@ -955,7 +955,9 @@ export function getInstanceJs(parentClass, addonTriggers, C3) {
         if (toggle === 1) {
           document.documentElement.requestFullscreen()
         } else {
-          document.exitFullscreen()
+          if (document.fullscreenEnabled) {
+            document.exitFullscreen()
+          }
         }
       }
     })