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packages/order-watcher/src/order_watcher/dependent_order_hashes_tracker.ts

@@ -89,6 +89,7 @@ export class DependentOrderHashesTracker {
                 (decodedMakerAssetData as ERC721AssetData).tokenId,
             );
         }
+        // If makerToken === ZRX then we already removed it and we don't need to remove it again.
         if ((decodedMakerAssetData as ERC20AssetData).tokenAddress !== this._zrxTokenAddress) {
             this._removeFromERC20DependentOrderhashes(signedOrder, this._zrxTokenAddress);
         }