diff --git a/zaqar/tests/unit/transport/websocket/test_protocol.py b/zaqar/tests/unit/transport/websocket/test_protocol.py
new file mode 100644
index 000000000..5de8b5694
--- /dev/null
+++ b/zaqar/tests/unit/transport/websocket/test_protocol.py
@@ -0,0 +1,47 @@
+# Copyright 2016 OpenStack Foundation.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import json
+
+import mock
+
+from zaqar.tests.unit.transport.websocket import base
+
+
+class TestMessagingProtocol(base.TestBase):
+    config_file = "websocket_mongodb.conf"
+
+    def setUp(self):
+        super(TestMessagingProtocol, self).setUp()
+        self.protocol = self.transport.factory()
+        self.defaults = self.api.get_defaults()
+
+    def tearDown(self):
+        super(TestMessagingProtocol, self).tearDown()
+
+    def test_on_mesage_with_invalid_input(self):
+        payload = u'\ufeff'
+        send_mock = mock.Mock()
+        self.protocol.sendMessage = send_mock
+
+        self.protocol.onMessage(payload, False)
+        resp = json.loads(send_mock.call_args[0][0])
+        self.assertEqual(400, resp['headers']['status'])
+
+        payload = "123"
+
+        self.protocol.onMessage(payload, False)
+        resp = json.loads(send_mock.call_args[0][0])
+        self.assertEqual(400, resp['headers']['status'])
diff --git a/zaqar/transport/websocket/protocol.py b/zaqar/transport/websocket/protocol.py
index 5a01cc13f..0a1e137a9 100644
--- a/zaqar/transport/websocket/protocol.py
+++ b/zaqar/transport/websocket/protocol.py
@@ -84,6 +84,12 @@ class MessagingProtocol(websocket.WebSocketServerProtocol):
             body = {'error': str(ex)}
             resp = self._handler.create_response(400, body)
             return self._send_response(resp)
+        if not isinstance(payload, dict):
+            body = {
+                'error': "Unexpected body type. Expected dict or dict like"
+            }
+            resp = self._handler.create_response(400, body)
+            return self._send_response(resp)
 
         req = self._handler.create_request(payload)
         resp = self._handler.validate_request(payload, req)