Created attachment 2064 [details]
patch to mitigate the crash

For some folders claws-mail crashes in this function because some of the pointed-to names are null. This happens to me with the version that is distributed version in Ubuntu LTS 20.4 as well as with a freshly compiled version from git.


This function is not really complicated so adding

+        else if (!a_ref || !b_ref)
+               return 1;
+        else if (!a_ref->name || !b_ref->name)
+               return 1;

helped. (I am attaching a patch, just in case.)

Knowing if there is a general assumption here, that these can't be null or not, is beyond my expertise as a simple user, but I would think that adding such a check is a good idea, anyhow.

Thanks
Jens