From 9dce9ed961ec650371f7d189fd2c423edbe74710 Mon Sep 17 00:00:00 2001
From: Matthias Dellweg <dellweg@atix.de>
Date: Fri, 8 Mar 2019 15:21:14 +0100
Subject: [PATCH] Check type before converting sync_date into string

---
 nailgun/entities.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/nailgun/entities.py b/nailgun/entities.py
index 8bd1e4ae..b70914f3 100644
--- a/nailgun/entities.py
+++ b/nailgun/entities.py
@@ -39,8 +39,8 @@
     _poll_task,
     _get_entity_ids,
     _payload,
-    to_json_serializable,
 )
+from nailgun.entity_mixins import to_json_serializable  # noqa: F401
 
 if version_info.major == 2:  # pragma: no cover
     from httplib import ACCEPTED, NO_CONTENT  # pylint:disable=import-error
@@ -7216,7 +7216,7 @@ def create_payload(self):
 
         """
         data = super(SyncPlan, self).create_payload()
-        if 'sync_date' in data:
+        if isinstance(data.get('sync_date'), datetime):
             data['sync_date'] = data['sync_date'].strftime('%Y-%m-%d %H:%M:%S')
         return data