diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 7cb54e3a..b2051234 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -844,7 +844,7 @@ class base_classes_crans(crans_ldap) :
 	for m in self.modifs :
 	    if sre.match('blacklist_*',m) :
 		serv.append(m)
-	    elif m == 'chbre' and '????' in [ self._init_data.get("chbre",[])[0] , self._data.get("chbre",[])[0] ] :
+	    elif m == 'chbre' and '????' in [ self._init_data.get("chbre",[''])[0] , self._data.get("chbre",[''])[0] ] :
 		serv.append('bl_chbre_invalide')
 	    else :
 		for s in annuaire_modif_service.get(m,[]) :