crash: photometric colour

[alacant]

Hi

Tried with 4fd79162

It didn’t crash, but wouldn’t solve.

It’s Abell 39 in Hercules:

Thanks for your time. Most likely my bad image:
https://drive.google.com/file/d/1CpC_AVeeZaXagWPptKfPBaOFCfaLbDE_/view?usp=sharing