Revert changeset #88c8c874f4b8. #88c8c874f4b8 try to fix crashing, but it blame to wrong code. If you look into runtime stack of xnjsmb_coord_remove(), you will find self argument is already wrong. It is in an invalid address.

divert([-1])

define([_arg1], [$1])

define([_foreach], [ifelse([$2], [()], [],
[define([$1], _arg1$2)$3[]_foreach([$1], (shift$2), [$3])])])

define([foreach], [pushdef([$1])_foreach($@)popdef([$1])])

divert[]dnl