diff --git a/lib/techniques/error/use.py b/lib/techniques/error/use.py
index 44e662043..e84f0680a 100644
--- a/lib/techniques/error/use.py
+++ b/lib/techniques/error/use.py
@@ -182,7 +182,7 @@ def _errorFields(expression, expressionFields, expressionFieldsList, num=None, e
         else:
             expressionReplaced = expression.replace(expressionFields, field, 1)
 
-        if isTechniqueAvailable(PAYLOAD.TECHNIQUE.QUERY) and Backend.isDbms(DBMS.FIREBIRD) and expressionReplaced.startswith("SELECT "):
+        if kb.technique == PAYLOAD.TECHNIQUE.QUERY and Backend.isDbms(DBMS.FIREBIRD) and expressionReplaced.startswith("SELECT "):
             expressionReplaced = "SELECT %s" % agent.concatQuery(expressionReplaced)
 
         output = NULL if emptyFields and field in emptyFields else _oneShotErrorUse(expressionReplaced, field)