@@ -439,7 +439,9 @@ bool CheckIfCallBackAllowsCreation(TileI
group = Resolve(GetIndustrySpec(type)->grf_prop.spritegroup, &object);
if (group == NULL || group->type != SGT_CALLBACK) return false;
/* Unlike the "normal" cases, not having a valid result means we allow
* the building of the industry, as that's how it's done in TTDP. */
if (group == NULL || group->type != SGT_CALLBACK) return true;
switch (group->g.callback.result) {
case 0x400: return true;