From 8a174beb44eb73d3134186b7551dd75efae01cdc Mon Sep 17 00:00:00 2001
From: Ulrich Germann <ugermann@inf.ed.ac.uk>
Date: Mon, 11 May 2015 00:30:32 +0100
Subject: [PATCH] Additional check for document map if document bias is
 requested.

---
 moses/TranslationModel/UG/mm/ug_bitext.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/moses/TranslationModel/UG/mm/ug_bitext.h b/moses/TranslationModel/UG/mm/ug_bitext.h
index ab5f2a24f..c1a065b0a 100644
--- a/moses/TranslationModel/UG/mm/ug_bitext.h
+++ b/moses/TranslationModel/UG/mm/ug_bitext.h
@@ -417,6 +417,8 @@ namespace Moses {
     ( string const& bserver, string const& text, ostream* log ) const
     {
       sptr<DocumentBias> ret;
+      UTIL_THROW_IF2(m_sid2docid == NULL,
+		     "Document bias requested but no document map loaded.");
       ret.reset(new DocumentBias(*m_sid2docid, m_docname2docid,
 				 bserver, text, log));
       return ret;