FWHM is NaN for some sources in FITS files

[zemogle]

I've notice that the source tables of most 1m and 0m4 frames have NaN values for the FWHM and FWTM columns. It's a var

Some of the files I've checked are:

tfn0m419-sq32-20250909-0160-e91
lsc1m005-fa15-20250909-0043-e91
lsc0m476-sq34-20250909-0226-e91
lsc0m476-sq34-20250901-0103-e91
ogg0m455-sq30-20250909-1440-e91
cpt1m010-fa14-20250731-0110-e91

I've looked at some 2m data and that does not appear to have the same issue