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-rw-r--r--src/newgrf.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/newgrf.cpp b/src/newgrf.cpp
index d13b1c83f..9037ea638 100644
--- a/src/newgrf.cpp
+++ b/src/newgrf.cpp
@@ -272,6 +272,8 @@ static StringID MapGRFStringID(uint32 grfid, StringID str)
TEXID_TO_STRINGID(0x482A, 0x483B, STR_482A_PRODUCTION_LAST_MONTH);
#undef TEXTID_TO_STRINGID
+ if (str == STR_NULL) return STR_EMPTY;
+
return str;
}