diff --git a/gpxpy/gpx.py b/gpxpy/gpx.py
index 52bc7ea3..f88b0840 100644
--- a/gpxpy/gpx.py
+++ b/gpxpy/gpx.py
@@ -2564,7 +2564,7 @@ def to_xml(self, version=None, prettyprint=True):
             if self.version:
                 version = self.version
             else:
-                version = '1.0'
+                version = '1.1'
 
         if version != '1.0' and version != '1.1':
             raise GPXException('Invalid version %s' % version)
diff --git a/gpxpy/gpxfield.py b/gpxpy/gpxfield.py
index a5a403f2..42090015 100644
--- a/gpxpy/gpxfield.py
+++ b/gpxpy/gpxfield.py
@@ -234,10 +234,11 @@ def from_xml(self, node, version):
             A string containing the email address.
         """
         email_node = node.find(self.tag)
+        if email_node is None:
+            return ''
 
         email_id = email_node.get('id')
         email_domain = email_node.get('domain')
-
         return '{0}@{1}'.format(email_id, email_domain)
 
     def to_xml(self, value, version, nsmap=None, prettyprint=True, indent=''):
diff --git a/test.py b/test.py
index c43c163f..d308b840 100644
--- a/test.py
+++ b/test.py
@@ -2917,6 +2917,48 @@ def test_write_read_extensions(self):
         print("Reading Track Point Extension")
         self.assertTrue(elements_equal(gpx.tracks[0].segments[0].points[0].extensions[0], root))
 
+    def test_no_10_extensions(self):
+        namespace = '{gpx.py}'
+        nsmap = {'ext' : namespace[1:-1]}
+        root = mod_etree.Element(namespace + 'tag')
+        root.text = 'text'
+        root.tail = 'tail'
+        
+        gpx = mod_gpx.GPX()
+        gpx.nsmap = nsmap
+
+        print("Inserting Waypoint Extension")
+        gpx.waypoints.append(mod_gpx.GPXWaypoint())
+        gpx.waypoints[0].latitude = 5
+        gpx.waypoints[0].longitude = 10
+        gpx.waypoints[0].extensions.append(root)
+
+        print("Inserting Metadata Extension")
+        gpx.metadata_extensions.append(root)
+
+        print("Inserting GPX Extension")
+        gpx.extensions.append(root)
+
+        print("Inserting Route Extension")
+        gpx.routes.append(mod_gpx.GPXRoute())
+        gpx.routes[0].extensions.append(root)
+        
+        print("Inserting Track Extension")
+        gpx.tracks.append(mod_gpx.GPXTrack())
+        gpx.tracks[0].extensions.append(root)
+
+        print("Inserting Track Segment Extension")
+        gpx.tracks[0].segments.append(mod_gpx.GPXTrackSegment())
+        gpx.tracks[0].segments[0].extensions.append(root)
+
+
+        print("Inserting Track Point Extension")
+        gpx.tracks[0].segments[0].points.append(mod_gpx.GPXTrackPoint(latitude=12, longitude=13))
+        gpx.tracks[0].segments[0].points[0].extensions.append(root)
+
+        xml = gpx.to_xml('1.0')
+        self.assertFalse('extension' in xml)
+
 
 class LxmlTest(mod_unittest.TestCase):
     @mod_unittest.skipIf(mod_os.environ.get('XMLPARSER')!="LXML", "LXML not installed")