Unexpected run control state RunControlState::Running when worker DebuggerRunTool started

I have Qt Widget application that I am working on for a while. I occasionally get this error message in the Application Output tab

12:27:47: Debugging starts
12:27:47: Unexpected run control state RunControlState::Running when worker DebuggerRunTool started.
Could not parse stylesheet of object 0x555555c24170
Could not parse stylesheet of object 0x555555c24170
12:27:48: Debugging has finished

The could not parse is my problem that I will have to fix. But I did see "Unexpected run ..." message without "Could not parse ...". So I do not think this is a problem

I found this bug QTCREATORBUG-19666 that is closed but there are no comments about why it was closed and I could not reopen it (Or at least I could not figure out how)

I do not remember seeing this message in past. on previous Qt Creator or Qt Version (5.9 was the last time I used to build it). Since I switched to 5.12.0 I started seeing this. This does happen then I just started to debug session.  

[EDIT]

I just started debug session and I got this message again but no "Could not parse ..."

12:45:29: Debugging starts
12:45:30: Unexpected run control state RunControlState::Running when worker DebuggerRunTool started.

Application still runs this time. So perhaps shutdown were caused by "Could not parse stylesheet of object"