Symptoms
When you run a query in which ISDATE or ISNUMERIC functions are used in Join conditions in Microsoft SQL Server 2014 Service Pack 1 (SP1), an access violation occurs.
Resolution
This problem was first fixed in the following cumulative update for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included in the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology Microsoft uses to describe software updates.