_handleSendError fix

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tx-manager",
-  "version": "0.2.7",
+  "version": "0.2.8",
   "description": "",
   "main": "index.js",
   "scripts": {

src/Transaction.js

@@ -268,8 +268,8 @@ class Transaction {
   }
 
   _handleSendError(e) {
-    if (e.code === 'SERVER_ERROR' && e.error) {
-      const message = e.error.message
+    if (e.error && e.error.code === 'SERVER_ERROR') {
+      const message = e.error.error.message
 
       // nonce is too low, trying to increase and resubmit
       if (this._hasError(message, nonceErrors)) {