Return is pensing events are undefined

1 files changed, 4 insertions, 0 deletions

diff --git a/packages/0x.js/src/order_watcher/event_watcher.ts b/packages/0x.js/src/order_watcher/event_watcher.ts
index 43a60957b..5d05bfb60 100644
--- a/packages/0x.js/src/order_watcher/event_watcher.ts
+++ b/packages/0x.js/src/order_watcher/event_watcher.ts
@@ -51,6 +51,10 @@ export class EventWatcher {
     }
     private async _pollForBlockchainEventsAsync(callback: EventWatcherCallback): Promise<void> {
         const pendingEvents = await this._getEventsAsync();
+        if (_.isUndefined(pendingEvents)) {
+            // HACK: This should never happen, but happens frequently on CI due to a ganache bug
+            return;
+        }
         if (pendingEvents.length === 0) {
             // HACK: Sometimes when node rebuilds the pending block we get back the empty result.
             // We don't want to emit a lot of removal events and bring them back after a couple of miliseconds,