diff --git a/lib/core/agent.py b/lib/core/agent.py
index 9321b1455..670420a6a 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -275,7 +275,7 @@ class Agent(object):
                     inferenceQuery = inference.query
 
                 payload = payload.replace("[INFERENCE]", inferenceQuery)
-            else:
+            elif not kb.testMode:
                 errMsg = "invalid usage of inference payload without "
                 errMsg += "knowledge of underlying DBMS"
                 raise SqlmapNoneDataException(errMsg)
diff --git a/lib/request/inject.py b/lib/request/inject.py
index e75b3d267..abc6d5a73 100644
--- a/lib/request/inject.py
+++ b/lib/request/inject.py
@@ -286,13 +286,14 @@ def _goBooleanProxy(expression):
 
     initTechnique(kb.technique)
 
-    query = agent.prefixQuery(kb.injection.data[kb.technique].vector)
-    query = agent.suffixQuery(query)
-    payload = agent.payload(newValue=query)
-    output = _goDns(payload, expression)
+    if conf.dnsName:
+        query = agent.prefixQuery(kb.injection.data[kb.technique].vector)
+        query = agent.suffixQuery(query)
+        payload = agent.payload(newValue=query)
+        output = _goDns(payload, expression)
 
-    if output is not None:
-        return output
+        if output is not None:
+            return output
 
     vector = kb.injection.data[kb.technique].vector
     vector = vector.replace("[INFERENCE]", expression)