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-rw-r--r--packages/0x.js/src/order_watcher/expiration_watcher.ts5
1 files changed, 4 insertions, 1 deletions
diff --git a/packages/0x.js/src/order_watcher/expiration_watcher.ts b/packages/0x.js/src/order_watcher/expiration_watcher.ts
index 6d9556336..f9c6571db 100644
--- a/packages/0x.js/src/order_watcher/expiration_watcher.ts
+++ b/packages/0x.js/src/order_watcher/expiration_watcher.ts
@@ -35,7 +35,10 @@ export class ExpirationWatcher {
);
}
public unsubscribe(): void {
- intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists as NodeJS.Timer);
+ if (_.isUndefined(this.orderExpirationCheckingIntervalIdIfExists)) {
+ throw new Error(ZeroExError.SubscriptionNotFound);
+ }
+ intervalUtils.clearAsyncExcludingInterval(this.orderExpirationCheckingIntervalIdIfExists);
delete this.callbackIfExists;
}
public addOrder(orderHash: string, expirationUnixTimestampSec: BigNumber): void {