diff --git a/backend.py b/backend.py
index 73a36f9..dbb14b5 100644
--- a/backend.py
+++ b/backend.py
@@ -269,7 +269,7 @@ class EventResource(BaseEvent):
           resp.status = falcon.HTTP_201
 
     def on_post(self, req, resp):
-        self.insert_or_update(req, resp, None, """INSERT INTO events ( events_type, events_what, events_when, events_tags, events_geo) VALUES (%s, %s, tstzrange(%s,%s,%s) , %s, %s) RETURNING events_id;""")
+        self.insert_or_update(req, resp, None, """INSERT INTO events ( events_type, events_what, events_when, events_tags, events_geo) VALUES (%s, %s, tstzrange(%s,%s,%s) , %s, %s) ON CONFLICT DO NOTHING RETURNING events_id;""")
 
     def on_put(self, req, resp, id):
         self.insert_or_update(req, resp, id, """UPDATE events SET ( events_type, events_what, events_when, events_tags, events_geo) = (%s, %s, tstzrange(%s,%s,%s) , %s, %s) WHERE events_id = %s RETURNING events_id;""")