diff --git a/wsdiscovery/message.py b/wsdiscovery/message.py
index 28de003..03db359 100644
--- a/wsdiscovery/message.py
+++ b/wsdiscovery/message.py
@@ -5,6 +5,9 @@
 from .actions import *
 from xml.dom import minidom
 
+import logging
+
+logger = logging.getLogger(__name__)
 
 def createSOAPMessage(env):
     "serialize SOAP envelopes into XML strings"
@@ -27,15 +30,20 @@ def parseSOAPMessage(data, ipAddr):
     "deserialize XML message strings into SOAP envelope objects"
     try:
         dom = minidom.parseString(data)
-    except Exception:
-        #print('Failed to parse message from %s\n"%s": %s' % (ipAddr, data, ex), file=sys.stderr)
+    except Exception as ex:
+        logger.debug('Failed to parse message from %s\n%s: %s', ipAddr, data, ex)
         return None
 
     if dom.getElementsByTagNameNS(NS_SOAPENV, "Fault"):
-        #print('Fault received from %s %s:' % (ipAddr, data), file=sys.stderr)
+        logger.debug('Fault received from %s: %s', ipAddr, data)
+        return None
+
+    actions = dom.getElementsByTagNameNS(NS_ADDRESSING, "Action")
+    if len(actions) == 0:
+        logger.warning('No action received from %s: %s', ipAddr, data)
         return None
 
-    soapAction = dom.getElementsByTagNameNS(NS_ADDRESSING, "Action")[0].firstChild.data.strip()
+    soapAction = actions[0].firstChild.data.strip()
     if soapAction == NS_ACTION_PROBE:
         return parseProbeMessage(dom)
     elif soapAction == NS_ACTION_PROBE_MATCH: