diff --git a/modules/database/src/ioc/db/dbConstLink.c b/modules/database/src/ioc/db/dbConstLink.c
index 153b39c93..5ba79f2b0 100644
--- a/modules/database/src/ioc/db/dbConstLink.c
+++ b/modules/database/src/ioc/db/dbConstLink.c
@@ -169,6 +169,9 @@ static long dbConstLoadScalar(struct link *plink, short dbrType, void *pbuffer)
         return dbPutConvertJSON(pstr, dbrType, pbuffer, &nReq);
     }
 
+    if(dbrType>=NELEMENTS(convert))
+        return S_db_badDbrtype;
+
     return convert[dbrType](pstr, pbuffer, NULL);
 }