diff --git a/javascript/GridFieldExtensions.js b/javascript/GridFieldExtensions.js
index fbfe90c..3011cce 100644
--- a/javascript/GridFieldExtensions.js
+++ b/javascript/GridFieldExtensions.js
@@ -205,7 +205,8 @@
 				});
 			},
 			onremove: function() {
-				this.sortable("destroy");
+                if(this.data('sortable'))
+				    this.sortable("destroy");
 			}
 		});