diff --git a/lib/lita/adapters/slack/event_loop.rb b/lib/lita/adapters/slack/event_loop.rb
index b78376a..8404234 100644
--- a/lib/lita/adapters/slack/event_loop.rb
+++ b/lib/lita/adapters/slack/event_loop.rb
@@ -15,7 +15,11 @@ def run
           end
 
           def safe_stop
-            EM.stop if EM.reactor_running?
+            EM.stop if running?
+          end
+
+          def running?
+            EM.reactor_running? && !EM.stopping?
           end
         end
       end
diff --git a/lib/lita/adapters/slack/rtm_connection.rb b/lib/lita/adapters/slack/rtm_connection.rb
index 0d416e0..90bae4d 100644
--- a/lib/lita/adapters/slack/rtm_connection.rb
+++ b/lib/lita/adapters/slack/rtm_connection.rb
@@ -49,7 +49,7 @@ def run(queue = nil, options = {})
             websocket.on(:message) { |event| receive_message(event) }
             websocket.on(:close) do
               log.info("Disconnected from Slack.")
-              shut_down
+              EventLoop.safe_stop
             end
             websocket.on(:error) { |event| log.debug("WebSocket error: #{event.message}") }
 
@@ -64,7 +64,7 @@ def send_messages(channel, strings)
         end
 
         def shut_down
-          if websocket
+          if websocket && EventLoop.running?
             log.debug("Closing connection to the Slack Real Time Messaging API.")
             websocket.close
           end
@@ -115,6 +115,7 @@ def websocket_options
           options[:proxy] = { :origin => config.proxy } if config.proxy
           options
         end
+
       end
     end
   end
diff --git a/spec/lita/adapters/slack/rtm_connection_spec.rb b/spec/lita/adapters/slack/rtm_connection_spec.rb
index d733a80..32188f3 100644
--- a/spec/lita/adapters/slack/rtm_connection_spec.rb
+++ b/spec/lita/adapters/slack/rtm_connection_spec.rb
@@ -29,7 +29,7 @@ def with_websocket(subject, queue)
   end
   let(:token) { 'abcd-1234567890-hWYd21AmMH2UHAkx29vb5c1Y' }
   let(:queue) { Queue.new }
-  let(:proxy_url) { "http://foo:3128" }
+  let(:proxy_url) { "http://example.com:3128" }
   let(:config) { Lita::Adapters::Slack.configuration_builder.build }
 
   before do
@@ -114,6 +114,16 @@ def with_websocket(subject, queue)
       # the WebSocket.
       subject.send(:receive_message, event)
     end
+
+    context "when the WebSocket is closed from outside" do
+      it "shuts down the reactor" do
+        with_websocket(subject, queue) do |websocket|
+            websocket.close
+            expect(EM.stopping?).to be_truthy
+          end
+      end
+    end
+
   end
 
   describe "#send_messages" do