diff --git a/javascript/HtmlEditorField.js b/javascript/HtmlEditorField.js
index ab672643b..e8e361f8f 100644
--- a/javascript/HtmlEditorField.js
+++ b/javascript/HtmlEditorField.js
@@ -1360,7 +1360,7 @@ function sapphiremce_cleanup(type, value) {
 
 	// if we are inserting from a popup back into the editor
 	// add the changed class and update the Content value
-	if(type == 'insert_to_editor') {
+	if(type == 'insert_to_editor' && typeof tinyMCE.selectedInstance.editorId !== 'undefined') {
 		var field = jQuery('#' + tinyMCE.selectedInstance.editorId);
 		var original = field.val();
 		if (original != value) {