value are allowed to be None

zopefoundation · Nov 20, 2015 · 5c18d02 · 5c18d02
1 parent 2892a41
commit 5c18d02
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/src/grokcore/catalog/index.py b/src/grokcore/catalog/index.py
@@ -165,6 +165,8 @@ class Value(AttributeIndexDefinition):
 
 
 def to_timestamp(dt):
+    if dt is None:
+        return None
     return calendar.timegm(dt.timetuple())