Fix a regression introduced in 0.1.12.

2 files changed, 2 insertions, 2 deletions

diff --git a/sqlparse/__init__.py b/sqlparse/__init__.py
index bfaaad3..983ee34 100644
--- a/sqlparse/__init__.py
+++ b/sqlparse/__init__.py
@@ -6,7 +6,7 @@
 """Parse SQL statements."""
 
 
-__version__ = '0.1.12'
+__version__ = '0.1.13-dev'
 
 
 # Setup namespace
diff --git a/sqlparse/engine/grouping.py b/sqlparse/engine/grouping.py
index 8236c49..15dc5de 100644
--- a/sqlparse/engine/grouping.py
+++ b/sqlparse/engine/grouping.py
@@ -117,7 +117,7 @@ def group_as(tlist):
         return not token.ttype in (T.DML, T.DDL)
 
     def _left_valid(token):
-        if token.ttype is T.Keyword and token.value in ('NULL'):
+        if token.ttype is T.Keyword and token.value in ('NULL',):
             return True
         return token.ttype is not T.Keyword