diff --git a/pelican/tests/test_pelican.py b/pelican/tests/test_pelican.py
index 2c7a77be..6816e7a8 100644
--- a/pelican/tests/test_pelican.py
+++ b/pelican/tests/test_pelican.py
@@ -265,3 +265,21 @@ class TestPelican(LoggedTestCase):
             sys.executable, '-m', 'pelican', '--help'
         ]).decode('ascii', 'replace')
         assert 'usage:' in output
+
+    def test_log_filter(self):
+        settings = read_settings(path=SAMPLE_CONFIG, override={
+            'PATH': INPUT_PATH,
+            'OUTPUT_PATH': self.temp_path,
+            'LOCALE': locale.normalize('en_US'),
+            'LOG_FILTER': [
+                (logging.WARN, 'CATEGORY_SAVE_AS is set to False'),
+                (logging.WARN, 'AUTHOR_SAVE_AS is set to None'),
+            ],
+            'CATEGORY_SAVE_AS': False,
+            'AUTHOR_SAVE_AS': None,
+        })
+        pelican = Pelican(settings=settings)
+        mute(True)(pelican.run)()
+        self.assertLogCountEqual(
+            count=0,  # LOG_FILTER should filter out the log messages
+            level=logging.WARNING)
diff --git a/pelican/urlwrappers.py b/pelican/urlwrappers.py
index cc276b3f..8ccb62c0 100644
--- a/pelican/urlwrappers.py
+++ b/pelican/urlwrappers.py
@@ -102,7 +102,7 @@ class URLWrapper(object):
         setting = "%s_%s" % (self.__class__.__name__.upper(), key)
         value = self.settings[setting]
         if not isinstance(value, str):
-            logger.warning('%s is set to %s', setting, value)
+            logger.warning('%s is set to %s' % (setting, value))
             return value
         else:
             if get_page_name:
diff --git a/pelican/writers.py b/pelican/writers.py
index 7bbd216e..bcae37f0 100644
--- a/pelican/writers.py
+++ b/pelican/writers.py
@@ -188,6 +188,7 @@ class Writer(object):
 
         if name is False or \
            name == "" or \
+           name is None or \
            not is_selected_for_writing(self.settings,
                                        os.path.join(self.output_path, name)):
             return