diff --git a/Source/player.cpp b/Source/player.cpp
index 36308e485..dd7bceb36 100644
--- a/Source/player.cpp
+++ b/Source/player.cpp
@@ -224,7 +224,8 @@ bool PlayerStruct::HasItem(int item, int *idx) const
 {
 	for (int i = 0; i < _pNumInv; i++) {
 		if (InvList[i].IDidx == item) {
-			*idx = i;
+			if (idx != nullptr)
+				*idx = i;
 			return true;
 		}
 	}