update

find_source/crawler/__init__.py

@@ -9,7 +9,7 @@ class BreadthCrawler(SearchEngine, VisitDomain):
     def __init__(self, workers=2, **kwargs):
         SearchEngine.__init__(self, **kwargs)
         VisitDomain.__init__(self, **kwargs)
-        self._workers = workers
+        self._workers = workers if workers < 2 else 2
 
     def start(self):
         with ThreadPoolExecutor(max_workers=self._workers) as executor: