diff --git a/homeassistant/components/automation/time.py b/homeassistant/components/automation/time.py
index 0197ae07d29..3d590ea8cfa 100644
--- a/homeassistant/components/automation/time.py
+++ b/homeassistant/components/automation/time.py
@@ -45,7 +45,7 @@ def trigger(hass, config, action):
                 and not convert(seconds.lstrip('/'), int) % 60 == 0:
             _LOGGER.warning('Periodic seconds should be divisible with 60'
                             'there will be an offset every minute')
-        if isinstance(minutes, str) and hours.startswith('/') \
+        if isinstance(hours, str) and hours.startswith('/') \
                 and not convert(hours.lstrip('/'), int) % 24 == 0:
             _LOGGER.warning('Periodic hours should be divisible with 24'
                             'there will be an offset every midnight')
diff --git a/homeassistant/helpers/event.py b/homeassistant/helpers/event.py
index 42d182b77da..6ca186a1744 100644
--- a/homeassistant/helpers/event.py
+++ b/homeassistant/helpers/event.py
@@ -215,4 +215,5 @@ def _matcher(subject, pattern):
             return subject % float(pattern[0].lstrip('/')) == 0
         except ValueError:
             return False
+
     return MATCH_ALL == pattern or subject in pattern
diff --git a/tests/helpers/test_event.py b/tests/helpers/test_event.py
index 0442fe9e2a0..2f760ee1382 100644
--- a/tests/helpers/test_event.py
+++ b/tests/helpers/test_event.py
@@ -299,3 +299,13 @@ class TestEventHelpers(unittest.TestCase):
         self._send_time_changed(datetime(2016, 5, 2, 0, 0, 0))
         self.hass.pool.block_till_done()
         self.assertEqual(2, len(specific_runs))
+
+    def test_periodic_task_wrong_input(self):
+        specific_runs = []
+
+        track_utc_time_change(
+            self.hass, lambda x: specific_runs.append(1), year='/two')
+
+        self._send_time_changed(datetime(2014, 5, 2, 0, 0, 0))
+        self.hass.pool.block_till_done()
+        self.assertEqual(1, len(specific_runs))