[BUGFIX] An js error is thrown in IRRE elements with RTE fields sometimes

class.tinymce.php

@@ -142,11 +142,11 @@ class tinyMCE {
 		$configuration = $this->tinymceConfiguration['preJS'];
 		$configuration .= '
 			var executeTinymceInit = function() {
-				if (!tinymce || !tinymce.init) {
+				if (!window.tinymce || (window.tinymce && !window.tinymce.init)) {
 					return;
 				}
 
-			 	tinymce.init({
+				window.tinymce.init({
 			 		' . $this->replaceTypo3Paths($this->tinymceConfiguration['configurationData']) . '
 			 	});
 			 };