diff --git a/lib/core/agent.py b/lib/core/agent.py
index a3c6355d7..c70794a4e 100644
--- a/lib/core/agent.py
+++ b/lib/core/agent.py
@@ -47,6 +47,11 @@ class Agent:
         elif query.startswith("; "):
             query = query.replace("; ", "", 1)
 
+        if Backend.getIdentifiedDbms() in (DBMS.ORACLE,):  # non-standard object(s) make problems to a database connector while returned (e.g. XMLTYPE)
+            _, _, _, _, _, _, fieldsToCastStr, _ = self.getFields(query)
+            for field in fieldsToCastStr.split(","):
+                query = query.replace(field, self.nullAndCastField(field))
+
         if kb.tamperFunctions:
             for function in kb.tamperFunctions:
                 query = function(payload=query)