From 18f8256a4a164bbd0d0a28c764c063eadd3e1370 Mon Sep 17 00:00:00 2001
From: Luca Zeug <spam@lucazeug.de>
Date: Wed, 22 Feb 2017 20:37:52 +0100
Subject: [PATCH] Fix toggleFullscreen() if icon is hidden

---
 src/js/simplemde.js | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/src/js/simplemde.js b/src/js/simplemde.js
index 3565d9d..8bb2889 100644
--- a/src/js/simplemde.js
+++ b/src/js/simplemde.js
@@ -211,12 +211,14 @@ function toggleFullScreen(editor) {
 
 
 	// Update toolbar button
-	var toolbarButton = editor.toolbarElements.fullscreen;
+	if (editor.toolbarElements.fullscreen) {
+		var toolbarButton = editor.toolbarElements.fullscreen;
 
-	if(!/active/.test(toolbarButton.className)) {
-		toolbarButton.className += " active";
-	} else {
-		toolbarButton.className = toolbarButton.className.replace(/\s*active\s*/g, "");
+		if(!/active/.test(toolbarButton.className)) {
+			toolbarButton.className += " active";
+		} else {
+			toolbarButton.className = toolbarButton.className.replace(/\s*active\s*/g, "");
+		}
 	}