diff --git a/CHANGELOG b/CHANGELOG
index 975757d6..2445db2b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,7 +1,15 @@
+Version 4.1.7 
+
+ * Merge patches from Ville S:
+    * https://github.com/jasonrbriggs/stomp.py/pull/56
+    * https://github.com/jasonrbriggs/stomp.py/pull/57
+
+
 Version 4.1.6 - Aug 2015
 
  * Generic exception catch on heartbeat send
  * Change default connection to the 1.2 protocol
+ * Fix timeout (https://github.com/jasonrbriggs/stomp.py/issues/55)
  
 
 Version 4.1.5 - Aug 2015
diff --git a/stomp/listener.py b/stomp/listener.py
index 5a9b0baa..64bdef4a 100755
--- a/stomp/listener.py
+++ b/stomp/listener.py
@@ -223,7 +223,7 @@ def on_send(self, frame):
         """
         Add the heartbeat header to the frame when connecting.
         """
-        if frame.cmd == 'CONNECT' or frame.cmd == 'STOMP':
+        if frame.cmd == CMD_CONNECT or frame.cmd == CMD_STOMP:
             if self.heartbeats != (0, 0):
                 frame.headers[HDR_HEARTBEAT] = '%s,%s' % self.heartbeats
 
diff --git a/stomp/protocol.py b/stomp/protocol.py
index 1533c247..cdf76206 100644
--- a/stomp/protocol.py
+++ b/stomp/protocol.py
@@ -49,7 +49,7 @@ def commit(self, transaction=None, headers={}, **keyword_headers):
         assert transaction is not None, "'transaction' is required"
         headers = utils.merge_headers([headers, keyword_headers])
         headers[HDR_TRANSACTION] = transaction
-        self.send_frame('COMMIT', headers)
+        self.send_frame(CMD_COMMIT, headers)
 
     def connect(self, username=None, passcode=None, wait=False, headers={}, **keyword_headers):
         cmd = CMD_CONNECT
@@ -155,7 +155,7 @@ def commit(self, transaction=None, headers={}, **keyword_headers):
         assert transaction is not None, "'transaction' is required"
         headers = utils.merge_headers([headers, keyword_headers])
         headers[HDR_TRANSACTION] = transaction
-        self.send_frame('COMMIT', headers)
+        self.send_frame(CMD_COMMIT, headers)
 
     def connect(self, username=None, passcode=None, wait=False, headers={}, **keyword_headers):
         cmd = CMD_STOMP
diff --git a/stomp/test/utils_test.py b/stomp/test/utils_test.py
index 7746d89c..dec5a3de 100644
--- a/stomp/test/utils_test.py
+++ b/stomp/test/utils_test.py
@@ -10,7 +10,7 @@ def test_returns_true_when_localhost(self):
         self.assertEquals(2, is_localhost(('192.168.1.92', 8000)))
 
     def test_convert_frame_to_lines(self):
-        f = Frame('SEND', { 'header1' : 'value1'}, 'this is the body')
+        f = Frame('SEND', {'header1' : 'value1', 'headerNone': None}, 'this is the body')
 
         lines = convert_frame_to_lines(f)
 
diff --git a/stomp/utils.py b/stomp/utils.py
index 1e9f3465..db8efe20 100755
--- a/stomp/utils.py
+++ b/stomp/utils.py
@@ -167,6 +167,8 @@ def convert_frame_to_lines(frame):
         lines.append(frame.cmd)
         lines.append("\n")
     for key, vals in sorted(frame.headers.items()):
+        if vals is None:
+            continue
         if type(vals) != tuple:
             vals = (vals,)
         for val in vals: