Fix unsubscribe bug

2018-07-09 16:16:48 -07:00
parent a481d2ab46
commit ee5ac6b800
1 changed files with 3 additions and 1 deletions
--- a/packages/website/ts/blockchain.ts
+++ b/packages/website/ts/blockchain.ts
@@ -537,7 +537,9 @@ export class Blockchain {
    }
    public destroy(): void {
        this._blockchainWatcher.destroy();
-        this._injectedProviderObservable.unsubscribe(this._injectedProviderUpdateHandler);
+        if (this._injectedProviderObservable) {
+            this._injectedProviderObservable.unsubscribe(this._injectedProviderUpdateHandler);
+        }
        this._stopWatchingExchangeLogFillEvents();
        this._stopWatchingGasPrice();
    }