From f54d572b3da49400c35d8bd78f18f900fe29c7ea Mon Sep 17 00:00:00 2001
From: Andre Medeiros <me@andremedeiros.info>
Date: Tue, 18 Sep 2018 16:30:32 -0400
Subject: [PATCH] Handle cases where deploy address isn't set

---
 lib/modules/deployment/contract_deployer.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/lib/modules/deployment/contract_deployer.js b/lib/modules/deployment/contract_deployer.js
index 7b76ed4b1..adff47350 100644
--- a/lib/modules/deployment/contract_deployer.js
+++ b/lib/modules/deployment/contract_deployer.js
@@ -44,7 +44,13 @@ class ContractDeployer {
       }
       let contractName = arg.substr(1);
       self.events.request('contracts:contract', contractName, (referedContract) => {
-        cb(null, referedContract.deployedAddress);
+        if(referedContract.deployedAddress !== undefined) {
+          return cb(null, referedContract.deployedAddress);
+        }
+
+        // Because we're referring to a contract that is not being deployed (ie. an interface),
+        // we still need to provide a valid address so that the ABI checker won't fail.
+        cb(null, '0x0000000000000000000000000000000000000000');
       });
     }