diff --git a/kallithea/lib/utils.py b/kallithea/lib/utils.py
--- a/kallithea/lib/utils.py
+++ b/kallithea/lib/utils.py
@@ -375,10 +375,12 @@ def set_app_settings(config):
 
     :param config:
     """
-    hgsettings = Setting.get_app_settings()
-
-    for k, v in hgsettings.items():
-        config[k] = v
+    try:
+        hgsettings = Setting.get_app_settings()
+        for k, v in hgsettings.items():
+            config[k] = v
+    finally:
+        meta.Session.remove()
 
 
 def set_vcs_config(config):