diff --git a/src/mappings/erc20Templates.ts b/src/mappings/erc20Templates.ts
index f9d44c68..4fd4a31a 100644
--- a/src/mappings/erc20Templates.ts
+++ b/src/mappings/erc20Templates.ts
@@ -62,6 +62,7 @@ export function handleOrderStarted(event: OrderStarted): void {
     }
   } else {
     log.info("nft not found", [])
+    order.nftOwner = ADDRESS_ZERO
   }
 
   const payer = getUser(event.params.payer.toHex())