From caf831fc284da19244e406253e40e4640c043bbc Mon Sep 17 00:00:00 2001
From: ed <s@ocv.me>
Date: Sun, 11 Jan 2026 17:10:16 +0000
Subject: [PATCH] fix ipu nullmapping; closes #1191

regression added in v1.19.21 / 79e1078671e609ff3bf140506b8cd6bfe68b6e36
---
 copyparty/authsrv.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/copyparty/authsrv.py b/copyparty/authsrv.py
index da944eb8..59830e1c 100644
--- a/copyparty/authsrv.py
+++ b/copyparty/authsrv.py
@@ -1829,7 +1829,7 @@ class AuthSrv(object):
         if self.args.ipu and not self.args.have_idp_hdrs:
             # syntax (CIDR=UNAME) is verified in load_ipu
             zsl = [x.split("=", 1)[1] for x in self.args.ipu]
-            zsl = [x for x in zsl if x not in acct]
+            zsl = [x for x in zsl if x and x not in acct]
             if zsl:
                 t = "ERROR: unknown users in ipu: %s" % (zsl,)
                 self.log(t, 1)