From 8d3ccf333d062629f5804bfa2cda95ce2b40b09e Mon Sep 17 00:00:00 2001
From: Fabio Berger <me@fabioberger.com>
Date: Tue, 23 Apr 2019 18:05:33 -0500
Subject: [PATCH] Fix race-condition bug

---
 packages/order-watcher/src/order_watcher/order_watcher.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/order-watcher/src/order_watcher/order_watcher.ts b/packages/order-watcher/src/order_watcher/order_watcher.ts
index 7550f5c3ab..78c619859f 100644
--- a/packages/order-watcher/src/order_watcher/order_watcher.ts
+++ b/packages/order-watcher/src/order_watcher/order_watcher.ts
@@ -493,6 +493,9 @@ export class OrderWatcher {
     private async _emitRevalidateOrdersAsync(orderHashes: string[], transactionHash?: string): Promise<void> {
         for (const orderHash of orderHashes) {
             const signedOrder = this._orderByOrderHash[orderHash];
+            if (signedOrder === undefined) {
+                continue;
+            }
             // Most of these calls will never reach the network because the data is fetched from stores
             // and only updated when cache is invalidated
             const orderState = await this._orderStateUtils.getOpenOrderStateAsync(signedOrder, transactionHash);