diff --git a/lib/cmds/blockchain/blockchain.js b/lib/cmds/blockchain/blockchain.js
index 86952fc2..7d4d244a 100644
--- a/lib/cmds/blockchain/blockchain.js
+++ b/lib/cmds/blockchain/blockchain.js
@@ -196,7 +196,7 @@ Blockchain.prototype.readyCallback = function() {
     this.onReadyCallback();
   }
 
-  if (this.config.mineWhenNeeded) {
+  if (this.config.mineWhenNeeded && !this.isDev) {
     const GethMiner = require('./miner');
     this.miner = new GethMiner();
   }
diff --git a/lib/core/proxy.js b/lib/core/proxy.js
index 888790c2..b6bfb955 100644
--- a/lib/core/proxy.js
+++ b/lib/core/proxy.js
@@ -67,8 +67,8 @@ exports.serve = function(ipc, host, port, ws){
         ws: ws
     });
 
-    proxy.on('error', function () {
-        console.error(__("Error forwarding requests to blockchain/simulator"));
+    proxy.on('error', function (e) {
+        console.error(__("Error forwarding requests to blockchain/simulator"), e);
     });
 
     proxy.on('proxyRes', (proxyRes) => {
@@ -79,7 +79,7 @@ exports.serve = function(ipc, host, port, ws){
             if(resBody){
                 parseResponse(ipc, resBody);
             }
-        });        
+        });
     });
 
     let server = http.createServer((req, res) => {