diff --git a/loops/server/psu.py b/loops/server/psu.py
index 2c3f5a7..f13ed54 100644
--- a/loops/server/psu.py
+++ b/loops/server/psu.py
@@ -51,6 +51,7 @@ def closeConnection():
     global conn
     if conn is not None:
         print('closing ZODB connection...')
+        commit()
         conn.close()
         conn = None