diff options
| -rw-r--r-- | src/newgrf_commons.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/newgrf_commons.cpp b/src/newgrf_commons.cpp index 823c0f918..5afcab114 100644 --- a/src/newgrf_commons.cpp +++ b/src/newgrf_commons.cpp @@ -50,6 +50,8 @@ OverrideManagerBase::~OverrideManagerBase() void OverrideManagerBase::Add(uint8 local_id, uint32 grfid, uint entity_type) { assert(entity_type < max_offset); + /* An override can be set only once */ + if (entity_overrides[entity_type] != invalid_ID) return; entity_overrides[entity_type] = local_id; grfid_overrides[entity_type] = grfid; } |