diff --git a/lib/core/option.py b/lib/core/option.py
index 660083a6f..7e2ffb10d 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -1489,7 +1489,6 @@ def _setKnowledgeBaseAttributes(flushAll=True):
 
     kb.brute = AttribDict({"tables":[], "columns":[]})
     kb.bruteMode = False
-    kb.busyFlag = False
 
     kb.cache = AttribDict()
     kb.cache.content = {}