Something wrong about dynamic boundary conditions

Hello,developers:
I modified coded in usr1.f.I want the gas velocity in inlet boundary is dynamic.But it only run one step,then there are wrongs.I don’t know why it occurs.
solar_03_2022-07-14T094752.541719.zip (280.6 KB)
I have support my bug report.Thank you very much!

Do you mean it crashes after the first time step? It runs fine with me.

yes, it crashes after the first time step

I am not able to reproduce the crash. Please try to build the debug solver and try again, this may point you to where the crash occurs.