From 3f39b22a680958988fbd7a8382dcd8d26420307f Mon Sep 17 00:00:00 2001
From: Jacob Evans <jacob@dekz.net>
Date: Tue, 14 Nov 2017 21:20:31 -0500
Subject: separate assignment and call

---
 packages/0x.js/src/contract_wrappers/contract_wrapper.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'packages/0x.js')

diff --git a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
index bd65c8eb3..7997b1647 100644
--- a/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
+++ b/packages/0x.js/src/contract_wrappers/contract_wrapper.ts
@@ -52,7 +52,8 @@ export class ContractWrapper {
             throw new Error(ZeroExError.SubscriptionNotFound);
         }
         if (!_.isUndefined(err)) {
-            this._filterCallbacks[filterToken](err, undefined);
+            const callback = this._filterCallbacks[filterToken];
+            callback(err, undefined);
         }
         delete this._filters[filterToken];
         delete this._filterCallbacks[filterToken];
-- 
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