diff --git a/ZScolar.py b/ZScolar.py
index 209a60940..4a536358d 100644
--- a/ZScolar.py
+++ b/ZScolar.py
@@ -108,7 +108,7 @@ import sco_dump_db
 
 from VERSION import SCOVERSION, SCONEWS
 
-if CONFIG.ABSOLUTE_URL:
+if hasattr(CONFIG, "ABSOLUTE_URL") and CONFIG.ABSOLUTE_URL:
     log("ScoDoc: ABSOLUTE_URL='%s'" % CONFIG.ABSOLUTE_URL)
 log("ScoDoc: using encoding %s" % SCO_ENCODING)
 
diff --git a/sco_utils.py b/sco_utils.py
index 732ed896f..9e9da47d7 100644
--- a/sco_utils.py
+++ b/sco_utils.py
@@ -230,7 +230,8 @@ except:
     sys.stderr.write("sco_utils: error in configuration file %s" % _config_filename)
     raise
 
-CODES_EXPL.update(CONFIG.CODES_EXPL)  # peremt de customiser les explications de codes
+if hasattr(CONFIG, "CODES_EXPL"):
+    CODES_EXPL.update(CONFIG.CODES_EXPL)  # permet de customiser les explications de codes
 
 
 if CONFIG.CUSTOM_HTML_HEADER: