I am for the moment just including jQuery (1.9.1, but old 1.8.3 behaved the same way) in my ASP.net webpage (Site.Master file actually). Everything worked fine running unde
Other than the message, is anything going wrong? As the comment says, "This should fail with an exception." The exception is handled by the assert() method and should not cause the program to terminate. There should be an option in Visual Studio to only show unhandled exceptions.
Further info: This page describes how to find the "JavaScript first chance exceptions" setting in Visual Studio, turning it off should eliminate what you are seeing. Note that you may not want to turn it off if you are debugging promises, the article in the link discusses it further. But I believe jQuery is handling the exception properly in this case and you wouldn't see the message if you weren't running in the debugger.