From 40ee661e418dd7866b9dc539fa6544cb12f9cd70 Mon Sep 17 00:00:00 2001
From: Julian Rother <julian@jrother.eu>
Date: Fri, 26 Feb 2021 16:44:30 +0100
Subject: [PATCH] Catch NULL dn values in 1-n-DBRelationship

---
 ldapalchemy/dbutils.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ldapalchemy/dbutils.py b/ldapalchemy/dbutils.py
index 009cd79..f7b0f09 100644
--- a/ldapalchemy/dbutils.py
+++ b/ldapalchemy/dbutils.py
@@ -59,7 +59,10 @@ class DBRelationship:
 			return self
 		if self.mapcls is not None:
 			return DBRelationshipSet(obj, self.relattr, self.ldapcls, self.mapcls)
-		return self.ldapcls.query.get(getattr(obj, self.relattr))
+		dn = getattr(obj, self.relattr)
+		if dn is not None:
+			return self.ldapcls.query.get(dn)
+		return None
 
 	def __set__(self, obj, values):
 		if self.mapcls is not None:
-- 
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