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-rw-r--r--src/map/trade.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/map/trade.c b/src/map/trade.c
index 9d2128690..ddb45a73b 100644
--- a/src/map/trade.c
+++ b/src/map/trade.c
@@ -142,8 +142,8 @@ void trade_tradeok(struct map_session_data *sd)
nullpo_retv(sd);
for(trade_i=0;trade_i<10;trade_i++) {
- if(sd->deal_item_amount[trade_i]>sd->status.inventory[sd->deal_item_index[trade_i]-2].amount ||
- sd->deal_item_amount[trade_i]<0) {
+ int idx = sd->deal_item_index[trade_i]-2;
+ if(((idx >= 0) && (sd->deal_item_amount[trade_i]>sd->status.inventory[idx].amount)) || sd->deal_item_amount[trade_i]<0) {
trade_tradecancel(sd);
return;
}