Fix a bug when undefined was been tried to convert to an array

2 files changed, 5 insertions, 1 deletions

diff --git a/packages/order-watcher/CHANGELOG.json b/packages/order-watcher/CHANGELOG.json
index dbb4824fc..c680ca935 100644
--- a/packages/order-watcher/CHANGELOG.json
+++ b/packages/order-watcher/CHANGELOG.json
@@ -5,6 +5,10 @@
             {
                 "note": "Start jsonRpcRequestId at 1, not 0 as 0 breaks the web3.js websocket RPC provider",
                 "pr": 1227
+            },
+            {
+                "note":
+                    "Fix the bug when order watcher was trying to convert undefined to an object in case of CancelUpTo event"
             }
         ]
     },
diff --git a/packages/order-watcher/src/order_watcher/dependent_order_hashes_tracker.ts b/packages/order-watcher/src/order_watcher/dependent_order_hashes_tracker.ts
index dbcc25186..1ec568a9b 100644
--- a/packages/order-watcher/src/order_watcher/dependent_order_hashes_tracker.ts
+++ b/packages/order-watcher/src/order_watcher/dependent_order_hashes_tracker.ts
@@ -50,7 +50,7 @@ export class DependentOrderHashesTracker {
         return uniqueOrderHashList;
     }
     public getDependentOrderHashesByMaker(makerAddress: string): string[] {
-        const dependentOrderHashes = Array.from(this._orderHashesByMakerAddress[makerAddress]);
+        const dependentOrderHashes = Array.from(this._orderHashesByMakerAddress[makerAddress] || {});
         return dependentOrderHashes;
     }
     public getDependentOrderHashesByAssetDataByMaker(makerAddress: string, assetData: string): string[] {