petmos
Used Python version: Python 3.10.12
Sorry, accidently closed the issue.
I tried the same SER file on a Windows installation and it worked there.
@jlanger : You check it a second time? Because in line 399 there is already this check and you check now again by doubling lines 399/400.
@DanielOgorchock : Oops, I didn't recognized the different last letter. Sorry.
The problem was in front of the monitor. I recorded with the wrong Bayer Matrix.