diff --git a/src/main/java/com/cubefury/vendingmachine/trade/TradeManager.java b/src/main/java/com/cubefury/vendingmachine/trade/TradeManager.java
index 568c735..e5368f9 100644
--- a/src/main/java/com/cubefury/vendingmachine/trade/TradeManager.java
+++ b/src/main/java/com/cubefury/vendingmachine/trade/TradeManager.java
@@ -183,6 +183,9 @@ public void setTradeState(@Nonnull UUID player, TradeGroup tg, TradeHistory hist
     }
 
     public boolean canExecuteTrade(@Nonnull UUID player, TradeGroup tg) {
+        if (tg == null) {
+            return false;
+        }
         long currentTimestamp = System.currentTimeMillis();
         TradeHistory history = getTradeState(player, tg);
         long lastTradeTime = history.lastTrade;