diff --git a/geventwebsocket/handler.py b/geventwebsocket/handler.py
index 9316e36..091f8f9 100644
--- a/geventwebsocket/handler.py
+++ b/geventwebsocket/handler.py
@@ -51,7 +51,7 @@ def run_websocket(self):
         try:
             self.server.clients[self.client_address] = Client(
                 self.client_address, self.websocket)
-            list(self.application(self.environ, lambda s, h, e=None: []))
+            self.application(self.environ, lambda s, h, e=None: [])
         finally:
             del self.server.clients[self.client_address]
             if not self.websocket.closed:
diff --git a/geventwebsocket/protocols/wamp.py b/geventwebsocket/protocols/wamp.py
index c89775b..de674ab 100644
--- a/geventwebsocket/protocols/wamp.py
+++ b/geventwebsocket/protocols/wamp.py
@@ -131,7 +131,7 @@ def __init__(self, *args, **kwargs):
         self.procedures = RemoteProcedures()
         self.prefixes = Prefixes()
         self.session_id = ''.join(
-            [random.choice(string.digits + string.letters)
+            [random.choice(string.digits + string.ascii_letters)
                 for i in range_type(16)])
 
         super(WampProtocol, self).__init__(*args, **kwargs)
diff --git a/geventwebsocket/utf8validator.py b/geventwebsocket/utf8validator.py
index d604f96..a4e2c12 100644
--- a/geventwebsocket/utf8validator.py
+++ b/geventwebsocket/utf8validator.py
@@ -210,10 +210,8 @@ def validate(self, ba):
                 state = self.state
                 while i < l:
                     # optimized version of decode(), since we are not interested in actual code points
-                    try:
-                        state = ord(UTF8VALIDATOR_DFA_S[256 + (state << 4) + ord(UTF8VALIDATOR_DFA_S[ba[i]])])
-                    except:
-                        import ipdb; ipdb.set_trace() 
+                    state = ord(UTF8VALIDATOR_DFA_S[256 + (state << 4) + ord(UTF8VALIDATOR_DFA_S[ba[i]])])
+
                     if state == UTF8_REJECT:
                         self.state = state
                         self.i += i