diff --git a/pasn1.py b/pasn1.py
index 69d1b86..2ece814 100644
--- a/pasn1.py
+++ b/pasn1.py
@@ -373,7 +373,7 @@ class ASN1Coder(object):
 			raise ValueError('last character must be Z')
 
 		# Real bug is in strptime, but work around it here.
-		if ' ' in data:
+		if ' ' in ts:
 			raise ValueError('no spaces are allowed')
 
 		if '.' in ts:
@@ -601,6 +601,7 @@ class TestCode(unittest.TestCase):
 		    set(), set((1,2,3)),
 		    set((1,'sjlfdkj', None, float('inf'))),
 		    datetime.datetime.utcnow(),
+		    [ datetime.datetime.utcnow(), ' ' ],
 		    datetime.datetime.utcnow().replace(microsecond=0),
 		    datetime.datetime.utcnow().replace(microsecond=1000),
 		    ]: