After dropdownlist postback inside update panel , My button which is outside update panel wont work

my dropdownlist is inside update panel, when i change the dropdownlist selection , my log out button won't wrk:

You can see that there's no error in console, but as soon as button is clicked after dropdownlist selection change , error begins. If i won't hange the selection and click on button then it log outs sucessfully.

NOTE :

I am using latest version of AJAX Control Toolkit using Nuget Package manager , my ASP.Net version is 4.0 , I tried to remove js from my master page and content page but still error happens on this specific page only.