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-rw-r--r--src/saveload/newgrf_sl.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/saveload/newgrf_sl.cpp b/src/saveload/newgrf_sl.cpp
index b2d2b0df9..f7f6ab72e 100644
--- a/src/saveload/newgrf_sl.cpp
+++ b/src/saveload/newgrf_sl.cpp
@@ -30,6 +30,7 @@ static const SaveLoad _newgrf_mapping_desc[] = {
void Save_NewGRFMapping(const OverrideManagerBase &mapping)
{
for (uint i = 0; i < mapping.GetMaxMapping(); i++) {
+ if (!mapping.IsValidID(i)) continue;
SlSetArrayIndex(i);
SlObject(&mapping.mapping_ID[i], _newgrf_mapping_desc);
}