Hey oden,
I was able to localize my problem! The main problem was, I didn’t know what ‘error’ to look for in Visual Studio, but since only one error showed up, I guessed that had to be the one and it was indeed! Just as you, my problem came from a select node leading into an IncrementInt node, however in my case all inputs were connected to variables.
http://puu.sh/pmZ9b/5babab58d2.jpg
EDIT: Using a SelectInt node with the following setup did not result in that error: