diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index dce51e85..553b1099 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -316,6 +316,10 @@ class crans_ldap :
 	
 	valeur = valeur.encode('utf-8')
 	
+	if not valeur :
+	    # On le lock pas un truc vide
+	    return True
+	
 	lock_dn = '%s=%s,%s' % ( item, valeur, self.base_lock )
 	lockid = '%s-%s' % (hostname, os.getpid() )
 	modlist = ldap.modlist.addModlist({ 'objectClass' : 'lock' ,