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-rw-r--r--src/vehicle_gui.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/vehicle_gui.cpp b/src/vehicle_gui.cpp
index 4478f330d..1bfd70b74 100644
--- a/src/vehicle_gui.cpp
+++ b/src/vehicle_gui.cpp
@@ -181,7 +181,7 @@ byte GetBestFittingSubType(Vehicle *v_from, Vehicle *v_for)
}
/* It has to be possible for v_for to carry the cargo of v_from. */
- assert(HasBit(e_for->info.refit_mask, v_from->cargo_type));
+ if (!HasBit(e_for->info.refit_mask, v_from->cargo_type)) return 0;
StringID expected_string = GetCargoSubtypeText(v_from);