diff --git a/.travis.yml b/.travis.yml
index 0fa76b9..b6c2935 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,14 +4,13 @@ sudo: false
 node_js:
   - "6"
   - "8"
-  - "9"
   - "10"
 
 git:
   depth: false
 
 env:
-  - STAN_VERSION=v0.8.0-beta
+  - STAN_VERSION=v0.11.0
 
 before_script:
   - wget "https://github.com/nats-io/nats-streaming-server/releases/download/$STAN_VERSION/nats-streaming-server-$STAN_VERSION-linux-amd64.zip" -O tmp.zip
@@ -21,10 +20,10 @@ before_script:
 
 
 script:
-  - if [[ "$TRAVIS_NODE_VERSION" == 4 ]]; then npm test; fi
-  - if [[ "$TRAVIS_NODE_VERSION" == 6 ]]; then npm test; fi
-  - if [[ "$TRAVIS_NODE_VERSION" == 8 ]]; then npm test; fi
-  - if [[ "$TRAVIS_NODE_VERSION" == 9 ]]; then npm run coveralls; fi
+  - npm test
+
+after_success:
+  - if [[ "$TRAVIS_NODE_VERSION" == 10 ]]; then npm run coveralls; fi
 
 after_failure:
   - cat nats-streaming-server/logs/*.log
\ No newline at end of file
diff --git a/Makefile b/Makefile
index 3b66898..cb23029 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ lint:
 	./node_modules/.bin/jshint ./test ./index.js ./lib/stan.js
 
 test:
-	@NODE_ENV=test ./node_modules/.bin/mocha -c\
+	@NODE_ENV=test ./node_modules/.bin/mocha --exit -c\
 	  --reporter list \
 	  --slow 5000 \
 	  --timeout 10000
diff --git a/README.md b/README.md
index 8cb945a..403534c 100644
--- a/README.md
+++ b/README.md
@@ -4,11 +4,12 @@ Node NATS Streaming is an extremely performant, lightweight reliable streaming p
 
 [![license](https://img.shields.io/github/license/nats-io/node-nats-streaming.svg)](https://www.apache.org/licenses/LICENSE-2.0)
 [![Travis branch](https://img.shields.io/travis/nats-io/node-nats-streaming/master.svg)]()
-[![Coveralls github branch](https://img.shields.io/coveralls/github/nats-io/node-nats-streaming/master.svg)]()
-[![npm](https://img.shields.io/npm/v/node-nats-streaming.svg)](https://www.npmjs.com/package/node-nats-streaming)
+[![Coverage Status](https://coveralls.io/repos/github/nats-io/node-nats-streaming/badge.svg?branch=master)](https://coveralls.io/github/nats-io/node-nats-streaming?branch=master)[![npm](https://img.shields.io/npm/v/node-nats-streaming.svg)](https://www.npmjs.com/package/node-nats-streaming)
 [![npm](https://img.shields.io/npm/dt/node-nats-streaming.svg)](https://www.npmjs.com/package/node-nats-streaming)
 
 
+
+
 NATS Streaming provides the following high-level feature set:
 - Log based persistence
 - At-Least-Once Delivery model, giving reliable message delivery
diff --git a/lib/stan.js b/lib/stan.js
index e17b656..f149f99 100644
--- a/lib/stan.js
+++ b/lib/stan.js
@@ -30,7 +30,7 @@ var util = require('util'),
 /**
  * Constants
  */
-var VERSION = '0.0.41',
+var VERSION = '0.0.50',
 DEFAULT_PORT = 4222,
 DEFAULT_PRE = 'nats://localhost:',
 DEFAULT_URI = DEFAULT_PRE + DEFAULT_PORT,
@@ -413,6 +413,7 @@ Stan.prototype.publish = function(subject, data, ackHandler) {
   if (this.nc === undefined) {
     if (util.isFunction(ackHandler)) {
       ackHandler(new Error(CONN_CLOSED));
+      return;
     } else {
       throw new Error(CONN_CLOSED);
     }
@@ -654,6 +655,7 @@ Subscription.prototype.close = function() {
 function closeOrUnsubscribe(that, doClose) {
   if(that.isClosed()) {
     that.emit('error', new Error(BAD_SUBSCRIPTION));
+    return;
   }
 
   var sc = that.stanConnection;
diff --git a/package.json b/package.json
index 4c15e0f..19010b5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-nats-streaming",
-  "version": "0.0.41",
+  "version": "0.0.50",
   "description": "Node.js client for NATS Streaming, a lightweight, high-performance cloud native messaging system",
   "keywords": [
     "nats",
@@ -29,18 +29,17 @@
   "contributors": [],
   "main": "./index.js",
   "scripts": {
-    "cover": "istanbul cover _mocha",
-    "coveralls": "npm run cover -- --report lcovonly && cat ./reports/coverage/lcov.info | coveralls",
+    "coveralls": "cat ./reports/coverage/lcov.info | coveralls",
     "depcheck": "dependency-check . lib/* lib/pb/*",
     "depcheck:unused": "dependency-check ./package.json --unused --no-dev lib/*.js",
     "gen": "protoc --js_out=import_style=commonjs,library=lib/pb/protocol_pb,binary:. lib/pb/protocol.proto",
     "lint": "jshint --reporter node_modules/jshint-stylish lib/*.js test/*.js test/support/*.js examples/*.js",
     "npm-publish": "npm publish https://github.com/nats-io/node-nats-streaming.git --access public",
     "test": "npm run depcheck && npm run depcheck:unused && npm run lint && npm run test:unit",
-    "test:unit": "mkdir -p reports/ && NODE_ENV=test multi='spec=- xunit=reports/mocha-xunit.xml' istanbul cover _mocha -- -R mocha-multi --timeout 10000 --slow 750 && istanbul check-coverage"
+    "test:unit": "mkdir -p reports/ && NODE_ENV=test multi='spec=- xunit=reports/mocha-xunit.xml' istanbul cover _mocha -- -R mocha-multi --exit --timeout 10000 --slow 750 && istanbul check-coverage"
   },
   "engines": {
-    "node": ">= 0.10.x <10.0.0"
+    "node": ">= 6.0.0"
   },
   "dependencies": {
     "google-protobuf": "^3.3.0",
@@ -48,14 +47,14 @@
     "nuid": "^1.0.0"
   },
   "devDependencies": {
-    "coveralls": "^2.11.2",
+    "coveralls": "^3.0.2",
     "dependency-check": "2.6.x",
     "istanbul": "^0.4.5",
-    "jshint": "^2.9.5",
+    "jshint": "^2.9.6",
     "jshint-stylish": "^2.2.1",
-    "mocha": "^3.0.2",
+    "mocha": "^5.2.0",
     "mocha-lcov-reporter": "1.2.x",
-    "mocha-multi": "^0.9.1",
+    "mocha-multi": "^1.0.1",
     "should": "^11.2.1"
   },
   "typings": "./index.d.ts"