App crashing during App review for new install - EXC_CRASH (SIGKILL)

We have had several submissions in for the app but it has never crashed on a new installation. It crashed during the review of a new version and we cannot reproduce this. From the crash report its seems the watchdog killed the app because it took more than the allocated time to go to the first scene

I am not great at interpreting the crash log. Can anyone please help me understand where exactly is the app waiting which results in the ultimate crashing because the watchdog is killing the app.

I have attached the crashlog.