Maybe a NULL check on line 198 might fix the issue (can not check myself atm):
if (!prim) { return Inkscape::Filters::NR_FILTER_SLOT_NOT_SET; }
Maybe a NULL check on line 198 might fix the issue (can not check myself atm):
if (!prim) :Filters: :NR_FILTER_ SLOT_NOT_ SET;
{
return Inkscape:
}