diff --git a/VERSION b/VERSION
index d4c7e23c..d18e38f1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-Version 2.9.9-stable+timestamp.2014.09.14.15.28.44
+Version 2.9.9-stable+timestamp.2014.09.14.16.01.43
diff --git a/gluon/dal.py b/gluon/dal.py
index 3855386a..9d5e0fa0 100644
--- a/gluon/dal.py
+++ b/gluon/dal.py
@@ -9864,8 +9864,8 @@ class Expression(object):
         """
         db = self.db
         if isinstance(value, (list, tuple)):
-            subqueries = [self.contains(v, case_sensitive=case_sensitive)
-                          for v in value if v]
+            subqueries = [self.contains(str(v), case_sensitive=case_sensitive)
+                          for v in value if str(v)]
             if not subqueries:
                 return self.contains('')
             else: