diff --git a/greenmine/base/api.py b/greenmine/base/api.py
index 5cbafba8..2026b0eb 100644
--- a/greenmine/base/api.py
+++ b/greenmine/base/api.py
@@ -11,17 +11,17 @@ from rest_framework.decorators import action
 from rest_framework.response import Response
 from rest_framework.permissions import IsAuthenticated
 from rest_framework import status, generics, viewsets
-from rest_framework import exceptions as excp
 
 import django_filters
 from haystack import query, inputs
 from djmail.template_mail import MagicMailBuilder
 
 from greenmine.base.serializers import (LoginSerializer, UserLogged,
-                                        UserSerializer, RoleSerializer)
+                                        UserSerializer, RoleSerializer,
+                                        SearchSerializer)
 
-from greenmine.base.serializers import SearchSerializer
 from greenmine.base.models import User, Role
+from greenmine.base import exceptions as excp
 from greenmine.scrum import models
 
 
@@ -35,7 +35,11 @@ class RolesViewSet(viewsets.ViewSet):
         return Response(serializer.data)
 
     def retrieve(self, request, pk=None):
-        role = Role.objects.get(pk=pk)
+        try:
+            role = Role.objects.get(pk=pk)
+        except Role.DoesNotExist:
+            raise excp.NotFound()
+
         serializer = self.serializer_class(role)
         return Response(serializer.data)
 
@@ -111,14 +115,14 @@ class UsersViewSet(viewsets.ViewSet):
         return Response({"detail": "Mail sended successful!"})
 
     @action(methods=["GET", "POST"])
-    def logout(self, request, pk=None)
+    def logout(self, request, pk=None):
         logout(request)
         return Response()
 
 
 class Search(viewsets.ViewSet):
     def list(self, request, **kwargs):
-        text = request.QUERY_PARAMS.get('text', None)
+        text = request.QUERY_PARAMS.get('text', "")
         project_id = request.QUERY_PARAMS.get('project', None)
 
         try:
@@ -126,6 +130,9 @@ class Search(viewsets.ViewSet):
         except models.Project.DoesNotExist:
             raise excp.PermissionDenied({"detail": "Wrong project id"})
 
+        #if not text:
+        #    raise excp.BadRequest("text parameter must be contains text")
+
         queryset = query.SearchQuerySet()
         queryset = queryset.filter(text=inputs.AutoQuery(text))
         queryset = queryset.filter(project_id=project_id)
diff --git a/greenmine/base/exceptions.py b/greenmine/base/exceptions.py
new file mode 100644
index 00000000..73a122b7
--- /dev/null
+++ b/greenmine/base/exceptions.py
@@ -0,0 +1,23 @@
+# -*- coding: utf-8 -*-
+
+from rest_framework import exceptions
+from rest_framework import status
+
+
+class PermissionDenied(exceptions.PermissionDenied):
+    pass
+
+
+class NotFound(exceptions.APIException):
+    status_code = status.HTTP_404_NOT_FOUND
+    default_detail = "Not found"
+
+    def __init__(self, detail=None):
+        self.detail = detail or self.default_detail
+
+
+class BadRequest(exceptions.ParseError):
+    default_detail = "Bad request"
+
+
+__all__ = ["PermissionDenied", "NotFound", "BadRequest"]