diff --git a/api/db.py b/api/db.py
index 712e5b8..987b8f3 100644
--- a/api/db.py
+++ b/api/db.py
@@ -51,6 +51,8 @@ def execDatabaseOperation(func, params):
 
         with conn:
             with conn.cursor(cursor_factory = psycopg2.extras.RealDictCursor) as cur:
+                params["params"] = [ v if not v=='' else None for v in params["params"] ]
+                logger.debug("edo: {}".format(str(params)))
                 return func(cur, params)
     except psycopg2.Error as err:
         raise Exception("Error when connecting to database: {}".format(err))