diff --git a/src/game/AuctionHouseMgr.cpp b/src/game/AuctionHouseMgr.cpp
index a57456a71c..294beed2fb 100644
--- a/src/game/AuctionHouseMgr.cpp
+++ b/src/game/AuctionHouseMgr.cpp
@@ -504,7 +504,7 @@ void AuctionHouseObject::Update()
     time_t curTime = sWorld.GetGameTime();
     ///- Handle expired auctions
 
-    // If storage is empty, no need to update.
+    // If storage is empty, no need to update. next == NULL in this case.
     if (AuctionsMap.empty())
         return;
 
@@ -512,7 +512,7 @@ void AuctionHouseObject::Update()
     if (next == AuctionsMap.end())
         next = AuctionsMap.begin();
 
-    ASSERT(next != NULL);
+    ASSERT(next != AuctionsMap.end());
 
     uint32 loopBreaker = 0;