diff --git a/wallace/__init__.py b/wallace/__init__.py
--- a/wallace/__init__.py
+++ b/wallace/__init__.py
@@ -335,8 +335,9 @@
         if os.access(conf.pidfile, os.R_OK):
             os.remove(conf.pidfile)
 
-        self.pool.close()
-        self.pool.join()
+        if hasattr(self, 'pool'):
+            self.pool.close()
+            self.pool.join()
 
         raise SystemExit