diff --git a/openerp/models.py b/openerp/models.py
index e7e803f2608..9529c3e1e5e 100644
--- a/openerp/models.py
+++ b/openerp/models.py
@@ -190,7 +190,7 @@ def get_pg_type(f, type_override=None):
     elif issubclass(field_type, (fields.char, fields.reference)):
         pg_type = ('varchar', pg_varchar(f.size))
     elif issubclass(field_type, fields.selection):
-        if (isinstance(f.selection, list) and isinstance(f.selection[0][0], int))\
+        if (f.selection and isinstance(f.selection, list) and isinstance(f.selection[0][0], int))\
                 or getattr(f, 'size', None) == -1:
             pg_type = ('int4', 'INTEGER')
         else: