Index: /FCKeditor/trunk/editor/_source/internals/fckselection_gecko.js
===================================================================
--- /FCKeditor/trunk/editor/_source/internals/fckselection_gecko.js	(revision 925)
+++ /FCKeditor/trunk/editor/_source/internals/fckselection_gecko.js	(revision 926)
@@ -54,5 +54,5 @@
 	var selectedElement = null ;
 
-	var selection = FCK.EditorWindow.getSelection() ;
+	var selection = !!FCK.EditorWindow && FCK.EditorWindow.getSelection() ;
 
 	if ( selection && selection.anchorNode && selection.anchorNode.nodeType == 1 )