diff --git a/doc/THANKS b/doc/THANKS
index 1a4b7fa72..d857fa924 100644
--- a/doc/THANKS
+++ b/doc/THANKS
@@ -577,6 +577,9 @@ Bedirhan Urgun <bedirhanurgun@gmail.com>
 Kyprianos Vasilopoulos <kyprianos.vasilopoulos@gmail.com>
     for reporting a couple of minor bugs
 
+Vlado Velichkovski <ketejadam@hotmail.com>
+    for reporting a couple of bugs
+
 Johnny Venter <johnny.venter@zoho.com>
     for reporting a couple of bugs
 
diff --git a/lib/techniques/union/test.py b/lib/techniques/union/test.py
index 11043f29e..12a683b8f 100644
--- a/lib/techniques/union/test.py
+++ b/lib/techniques/union/test.py
@@ -52,7 +52,7 @@ def __findUnionCharCount(comment, place, parameter, value, prefix, suffix, where
             query = agent.suffixQuery(query, suffix=suffix, comment=comment)
             payload = agent.payload(newValue=query, place=place, parameter=parameter, where=where)
             page, headers = Request.queryPage(payload, place=place, content=True, raise404=False)
-            return not re.search(r"(warning|error|order by)", page or "", re.I) and comparison(page, headers)
+            return not re.search(r"(warning|error|order by|failed)", page or "", re.I) and comparison(page, headers)
 
         if __orderByTest(1) and not __orderByTest(randomInt()):
             infoMsg = "ORDER BY technique seems to be usable. "