1 files changed, 9 insertions, 2 deletions

diff --git a/src/mailman/core/runner.py b/src/mailman/core/runner.py
index f088e29bb..05a70ce5b 100644
--- a/src/mailman/core/runner.py
+++ b/src/mailman/core/runner.py
@@ -52,6 +52,7 @@ elog = logging.getLogger('mailman.error')
 @implementer(IRunner)
 class Runner:
     intercept_signals = True
+    is_non_queue_runner = False
 
     def __init__(self, name, slice=None):
         """Create a runner.
@@ -68,8 +69,14 @@ class Runner:
         substitutions['name'] = name
         self.queue_directory = expand(section.path, substitutions)
         numslices = int(section.instances)
-        self.switchboard = Switchboard(
-            name, self.queue_directory, slice, numslices, True)
+        # Check whether the runner is queue runner or not; non queue runner should not have queue_directory or switchboard instance.
+        if self.is_non_queue_runner:
+            self.queue_directory = None
+            self.switchboard= None
+        else:
+            self.queue_directory = expand(section.path, substitutions)
+            self.switchboard = Switchboard(
+                name, self.queue_directory, slice, numslices, True)
         self.sleep_time = as_timedelta(section.sleep_time)
         # sleep_time is a timedelta; turn it into a float for time.sleep().
         self.sleep_float = (86400 * self.sleep_time.days +