diff --git a/scrapy/commands/check.py b/scrapy/commands/check.py
index a479600eb..297f59b3a 100644
--- a/scrapy/commands/check.py
+++ b/scrapy/commands/check.py
@@ -21,7 +21,7 @@ def _generate(cb):
 class Command(ScrapyCommand):
     requires_project = True
     multi_crawlers = True
-    default_settings = {'LOG_ENABLED': True}
+    default_settings = {'LOG_ENABLED': False}
 
     def syntax(self):
         return "[options] <spider>"
diff --git a/scrapy/crawler.py b/scrapy/crawler.py
index c88e1641d..4c650c41c 100644
--- a/scrapy/crawler.py
+++ b/scrapy/crawler.py
@@ -153,7 +153,9 @@ class MultiCrawlerProcess(ProcessMixin):
         name, crawler = self.crawlers.popitem()
 
         crawler.sflo = log.start_from_crawler(crawler)
-        crawler.signals.connect(crawler.sflo.stop, signals.engine_stopped)
+        if crawler.sflo:
+            crawler.signals.connect(crawler.sflo.stop, signals.engine_stopped)
+
         crawler.signals.connect(self.check_done, signals.engine_stopped)
         crawler.start()