2 files changed, 1 insertions, 28 deletions
diff --git a/packages/0x.js/src/contract.ts b/packages/0x.js/src/contract.ts
index 25a0609aa..0cd3a315f 100644
--- a/packages/0x.js/src/contract.ts
+++ b/packages/0x.js/src/contract.ts
@@ -58,7 +58,7 @@ export class Contract implements Web3.ContractInstance {
             const promise = new Promise(async (resolve, reject) => {
                 const lastArg = args[args.length - 1];
                 let txData: Partial<Web3.TxData> = {};
-                if (this.isTxData(lastArg)) {
+                if (!_.isUndefined(lastArg) && this.isTxData(lastArg)) {
                     txData = args.pop();
                 }
                 // Gas amount sourced with the following priorities:
diff --git a/packages/0x.js/src/subproviders/empty_wallet_subprovider.ts b/packages/0x.js/src/subproviders/empty_wallet_subprovider.ts
deleted file mode 100644
index 2993bc801..000000000
--- a/packages/0x.js/src/subproviders/empty_wallet_subprovider.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import {JSONRPCPayload} from '../types';
-
-/*
- * This class implements the web3-provider-engine subprovider interface and returns
- * that the provider has no addresses when queried.
- * Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
- */
-export class EmptyWalletSubProvider {
-    // This method needs to be here to satisfy the interface but linter wants it to be static.
-    // tslint:disable-next-line:prefer-function-over-method
-    public handleRequest(payload: JSONRPCPayload, next: () => void, end: (err: Error|null, result: any) => void) {
-        switch (payload.method) {
-            case 'eth_accounts':
-                end(null, []);
-                return;
-
-            default:
-                next();
-                return;
-        }
-    }
-    // Required to implement this method despite not needing it for this subprovider
-    // tslint:disable-next-line:prefer-function-over-method
-    public setEngine(engine: any) {
-        // noop
-    }
-}