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-rw-r--r--src/newgrf_industries.cpp4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/newgrf_industries.cpp b/src/newgrf_industries.cpp
index 8703ab417..abd9be1c5 100644
--- a/src/newgrf_industries.cpp
+++ b/src/newgrf_industries.cpp
@@ -439,7 +439,9 @@ bool CheckIfCallBackAllowsCreation(TileIndex tile, IndustryType type, uint itspe
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;