From bca62c813d2e821c56968916615861366402435b Mon Sep 17 00:00:00 2001
From: Alex Browne <stephenalexbrowne@gmail.com>
Date: Mon, 4 Jun 2018 18:10:42 -0700
Subject: Throw in web3-wrapper when rawCallResult is '0x'

---
 packages/web3-wrapper/src/web3_wrapper.ts | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'packages/web3-wrapper')

diff --git a/packages/web3-wrapper/src/web3_wrapper.ts b/packages/web3-wrapper/src/web3_wrapper.ts
index ace6a2d61..ed2d0a119 100644
--- a/packages/web3-wrapper/src/web3_wrapper.ts
+++ b/packages/web3-wrapper/src/web3_wrapper.ts
@@ -315,6 +315,9 @@ export class Web3Wrapper {
      */
     public async callAsync(callData: CallData, defaultBlock?: BlockParam): Promise<string> {
         const rawCallResult = await promisify<string>(this._web3.eth.call)(callData, defaultBlock);
+        if (rawCallResult === '0x') {
+            throw new Error('Contract call failed (returned null)');
+        }
         return rawCallResult;
     }
     /**
-- 
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