diff --git a/fail2ban/server/utils.py b/fail2ban/server/utils.py
index 58363ff0..8569a3f2 100644
--- a/fail2ban/server/utils.py
+++ b/fail2ban/server/utils.py
@@ -102,7 +102,7 @@ class Utils():
 		def unset(self, k):
 			try:
 				del self._cache[k]
-			except KeyError: # pragme: no cover
+			except KeyError:
 				pass
 
 
diff --git a/fail2ban/tests/filtertestcase.py b/fail2ban/tests/filtertestcase.py
index b5877b7f..2bbfcd9d 100644
--- a/fail2ban/tests/filtertestcase.py
+++ b/fail2ban/tests/filtertestcase.py
@@ -1640,6 +1640,8 @@ class DNSUtilsTests(unittest.TestCase):
 			c.set(i, i)
 		for i in xrange(5):
 			self.assertEqual(c.get(i), i)
+		# remove unavailable key:
+		c.unset('a'); c.unset('a')
 
 	def testCacheMaxSize(self):
 		c = Utils.Cache(maxCount=5, maxTime=60)