Forgot to check for the non-existance of a complete function.

diff --git a/fx/fx.js b/fx/fx.js
index 34c0e26..e8474a8 100644 (file)
--- a/fx/fx.js
+++ b/fx/fx.js
@@ -263,7 +263,7 @@ jQuery.fx = function( elem, options, prop ){
                                jQuery.setAuto( z.el, prop );
 
                        // If a callback was provided, execute it
-                       if( z.o.complete.constructor == Function ) {
+                       if( z.o.complete && z.o.complete.constructor == Function ) {
 
                                // Yes, this is a weird place for this, but it needs to be executed
                                // only once per cluster of effects.