diff --git a/openerp/http.py b/openerp/http.py
index 507afc748fd..90dbb6bbe86 100644
--- a/openerp/http.py
+++ b/openerp/http.py
@@ -1200,7 +1200,7 @@ def db_list(force=False, httprequest=None):
 
 def db_filter(dbs, httprequest=None):
     httprequest = httprequest or request.httprequest
-    h = httprequest.environ['HTTP_HOST'].split(':')[0]
+    h = httprequest.environ.get('HTTP_HOST', '').split(':')[0]
     d = h.split('.')[0]
     r = openerp.tools.config['dbfilter'].replace('%h', h).replace('%d', d)
     dbs = [i for i in dbs if re.match(r, i)]