diff --git a/tests/test_types.py b/tests/test_types.py
index e8028aa1..1201d2c2 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -44,6 +44,10 @@ class TestSortedCorrectedCommandsSequence(object):
         assert set(seq) == {CorrectedCommand('ls', priority=100),
                             CorrectedCommand('ls', side_effect, 300)}
 
+    def test_with_blank(self, settings):
+        seq = SortedCorrectedCommandsSequence(iter([]), settings)
+        assert list(seq) == []
+
 
 class TestCorrectedCommand(object):
 
diff --git a/thefuck/types.py b/thefuck/types.py
index 69b174ea..cf091376 100644
--- a/thefuck/types.py
+++ b/thefuck/types.py
@@ -81,9 +81,10 @@ class SortedCorrectedCommandsSequence(object):
 
     def _realise(self):
         """Realises generator, removes duplicates and sorts commands."""
-        commands = self._remove_duplicates(self._commands)
-        self._cached = [self._cached[0]] + sorted(
-            commands, key=lambda corrected_command: corrected_command.priority)
+        if self._cached:
+            commands = self._remove_duplicates(self._commands)
+            self._cached = [self._cached[0]] + sorted(
+                commands, key=lambda corrected_command: corrected_command.priority)
         self._realised = True
         debug('SortedCommandsSequence was realised with: {}, after: {}'.format(
             self._cached, '\n'.join(format_stack())), self._settings)