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-rw-r--r--src/ajax/ajax.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ajax/ajax.js b/src/ajax/ajax.js
index 9c94e13d3..b872481ab 100644
--- a/src/ajax/ajax.js
+++ b/src/ajax/ajax.js
@@ -799,7 +799,7 @@ jQuery.extend({
// Serialize the key/values
for ( var j in a )
// If the value is an array then the key names need to be repeated
- if ( a[j].constructor == Array )
+ if ( a[j] && a[j].constructor == Array )
jQuery.each( a[j], function(){
s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
});