asp.net - Telerik Javascript error on unload page -

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i using telerik controls in asp.net web application. facing javascript error on unload page:

unable set value of property '_events': object null or undefined

i facing issue when have merged/combined asp.net website mvc4. have searched on google unable find solution.

edit:

i found problem:

when radcombobox empty error occurred. radcombobox load data @ runtime (when user clicks on it).

any solution this?

which telerik controls using? version? if using ajaxcontroltoolkit in same project, try removing (delete assembly , reference, rebuild) , see if helps.


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