Index: /FCKeditor/branches/developers/alfonsoml/editor/_source/fckeditorapi.js
===================================================================
--- /FCKeditor/branches/developers/alfonsoml/editor/_source/fckeditorapi.js	(revision 162)
+++ /FCKeditor/branches/developers/alfonsoml/editor/_source/fckeditorapi.js	(revision 163)
@@ -50,7 +50,10 @@
 					'for ( var name in FCKeditorAPI.__Instances )' +
 					'{' +
-						'var oEditor = FCKeditorAPI.__Instances[ name ] ;' +
-						'if ( oEditor.GetParentForm() == this )' +
-							'oEditor.UpdateLinkedField() ;' +
+						'if (!(name in Object.prototype))' +
+						'{' +
+							'var oEditor = FCKeditorAPI.__Instances[ name ] ;' +
+							'if ( oEditor.GetParentForm() == this )' +
+								'oEditor.UpdateLinkedField() ;' +
+						'}' +
 					'}' +
 					'this._FCKOriginalSubmit() ;' +