diff --git a/src/eoatex2imxml.py b/src/eoatex2imxml.py
index 2c24f80..7e08a79 100755
--- a/src/eoatex2imxml.py
+++ b/src/eoatex2imxml.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8; mode: python -*-
-# Time-stamp: <2019-12-17 13:07:39 (kthoden)>
+# Time-stamp: <2019-12-17 16:52:20 (kthoden)>
 
 """
 Converts Latex files into a customized DocBook XML file.
@@ -1160,6 +1160,11 @@ def insert_bibliographies(
             xml_element,
             citations_json
     )
+
+    if not language:
+        logging.warning("Missing a language. Falling back to English.")
+        language = "en"
+
     logging.info( "keywords:" )
     logging.info( keyword_to_print_bibl_el.keys() )
     if len(keyword_to_print_bibl_el) > 0: