Lua error in Module:User:Benwing2/sla-derived_terms at [[Module:User:Benwing2/sla-derived_terms#L-247|line 247]]: attempt to call field 'shallowcopy' (a nil value)

Backtrace:

Module:User:Benwing2/sla-derived_terms:247: in function "prefix_template_suffixes"
Module:User:Benwing2/sla-derived_terms:263: in function "parse_aspect_pair"
Module:User:Benwing2/sla-derived_terms:366: in function "parse_args"
Module:User:Benwing2/sla-derived_terms:498: in function "chunk"
mw.lua:527: ?
[C]: ?