diff --git a/api/js/framework/fw_base.js b/api/js/framework/fw_base.js
index b6f1887dc0..038417cd06 100644
--- a/api/js/framework/fw_base.js
+++ b/api/js/framework/fw_base.js
@@ -1331,13 +1331,13 @@ var fw_base = (function(){ "use strict"; return Class.extend(
 	 */
 	_setDarkMode: function(_state)
 	{
-		let state = _state == '0' ?'0':'1';
+		let state = !_state || _state == '0' ?'0':'1';
 		jQuery('html').attr('data-darkmode', state);
 		jQuery('iframe').each((i, frame) =>{
 			try {
 				if (frame && frame.contentWindow && frame.contentWindow.jQuery)
 				{
-					frame.contentWindow.jQuery('html').attr('data-darkmode', _state == 0?'':'1');
+					frame.contentWindow.jQuery('html').attr('data-darkmode', state == 0?'':'1');
 				}
 			}catch(e)
 			{