Index: /CKEditor/trunk/_source/plugins/tabletools/dialogs/tableCell.js
===================================================================
--- /CKEditor/trunk/_source/plugins/tabletools/dialogs/tableCell.js	(revision 5176)
+++ /CKEditor/trunk/_source/plugins/tabletools/dialogs/tableCell.js	(revision 5177)
@@ -238,5 +238,5 @@
 														textAlignStyle = element.getStyle( 'text-align');
 
-												this.setValue(  textAlignStyle || alignAttr );
+												this.setValue(  textAlignStyle || alignAttr || '' );
 											},
 											commit : function( selectedCell )
@@ -284,5 +284,5 @@
 												}
 
-												this.setValue( vAlignStyle || vAlignAttr  );
+												this.setValue( vAlignStyle || vAlignAttr || '' );
 											},
 											commit : function( element )