diff --git a/sorting/ip-address.js b/sorting/ip-address.js
index 28ff323..48c1398 100644
--- a/sorting/ip-address.js
+++ b/sorting/ip-address.js
@@ -18,6 +18,7 @@
 
 jQuery.extend( jQuery.fn.dataTableExt.oSort, {
 	"ip-address-pre": function ( a ) {
+		if (!a) { return 0 }
 		var i, item;
 		var m = a.split("."),
 			n = a.split(":"),
@@ -100,4 +101,4 @@ jQuery.extend( jQuery.fn.dataTableExt.oSort, {
 	"ip-address-desc": function ( a, b ) {
 		return ((a < b) ? 1 : ((a > b) ? -1 : 0));
 	}
-});
\ No newline at end of file
+});