Fail to run custom builds on TeamCity 2018.1.2

[Chhed13]

We just upgraded to TC 2018.1.2 and found that Matrix tab is broken.
I found unreleased fix, compile and apply new version, after that matrix tab is fixed, BUT any custom build (3 dots new run button) that contains Matrix throw an exception with huge stack trace.
Further more, if and matrix build was added in the queue, you can't open tab with queue
Log is here: TC-custom-build-exception.log

Is it possible to hot fix it? Rollback of a whole server is not what we want

[Chhed13]

Hi, it looks we found the solution.
This exception was caused due to simultaneous upgrade of Matrix plugin from 1.0.0 to 1.0.2 (unreleased).
In version 1.0.1 parameter Const build parameters become mandatory, but we already had a lot of matrix configurations that didn't have it. After we fill this field everything becomes normal, but of course we had to suppress this exception and recompile plugin, before we had a chance to see what is going on.
The issue is solved

[presidentio]

@Chhed13 I'm sorry I don't have a time to work on this plugin. If you have time to prepare PR, I will be glad to review it and merge

[Chhed13]

@presidentio that's ok. I made small PR that helped us to find the root cause and fix changed params