Why is observers not defined runtime error coming? The following is
the error. How this can be avoided ?

A runtime error has occurred.

Line: 4206
Error: 'length' is null or not an object


MochiKit.Base.update(MochiKit.Signal,{__repr__:function(){
return "["+this.NAME+" "+this.VERSION+"]";
},toString:function(){
return this.__repr__();
},_unloadCache:function(){
var self=MochiKit.Signal;
var _548=self._observers;
for(var i=0;i<_548.length;i++){    <===== error is in this line
self._disconnect(_548[i]);
}
delete self._observers;
try{
window.onload=undefined;
}
catch(e){

Thanks and Regards
Pearl


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