When you run a Transaction Integrator transaction in Microsoft Host Integration Server 2013, you may randomly receive the following error message:
Object reference not set to an instance of an object.
This problem occurs because of a small timing window that enables a thread to obtain a trace container that is not completely filled.
Cumulative update information
The fix that resolves this problem is included in Cumulative Update 1 for Host Integration Server 2013.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.