diff --git a/cabot/cabotapp/models/base.py b/cabot/cabotapp/models/base.py
index 69c0728c8..efadd3e61 100644
--- a/cabot/cabotapp/models/base.py
+++ b/cabot/cabotapp/models/base.py
@@ -59,6 +59,9 @@ def default_calculate_debounced_passing(recent_results, debounce=0):
     """
     if not recent_results:
         return True
+    # fix when the first run, if the first 0 - debounce checks all error and mark result faild
+    if len(recent_results) < debounce:
+        return True
     debounce_window = recent_results[:debounce + 1]
     for r in debounce_window:
         if r.succeeded:
diff --git a/cabot/cabotapp/models/jenkins_check_plugin.py b/cabot/cabotapp/models/jenkins_check_plugin.py
index 32a216df9..b48fe4a1e 100644
--- a/cabot/cabotapp/models/jenkins_check_plugin.py
+++ b/cabot/cabotapp/models/jenkins_check_plugin.py
@@ -78,6 +78,7 @@ def calculate_debounced_passing(self, recent_results, debounce=0):
         return last_result.consecutive_failures <= debounce
 
 
+
 class JenkinsConfig(models.Model):
     name = models.CharField(max_length=30, blank=False)
     jenkins_api = models.CharField(max_length=2000, blank=False)
diff --git a/cabot/cabotapp/tests/tests_jenkins.py b/cabot/cabotapp/tests/tests_jenkins.py
index 8983e6cd6..ee598d25b 100644
--- a/cabot/cabotapp/tests/tests_jenkins.py
+++ b/cabot/cabotapp/tests/tests_jenkins.py
@@ -82,6 +82,7 @@ def test_job_failing(self, mock_jenkins):
         self.assertEqual(result.consecutive_failures, 1)
         self.assertFalse(result.succeeded)
 
+
     @freeze_time('2017-03-02 10:30')
     @patch("cabot.cabotapp.jenkins._get_jenkins_client")
     def test_job_queued_last_succeeded(self, mock_jenkins):
diff --git a/cabot/cabotapp/views.py b/cabot/cabotapp/views.py
index 1b8c16113..decd2ba37 100644
--- a/cabot/cabotapp/views.py
+++ b/cabot/cabotapp/views.py
@@ -1072,7 +1072,7 @@ def get(self, request):
 
         return Response(users_json)
 
-
+      
 # Misc JSON api and other stuff