From ffe69cb32802cb3a53f91efe5ba83e3d3890a6a0 Mon Sep 17 00:00:00 2001
From: SomberNight <somber.night@protonmail.com>
Date: Tue, 3 Apr 2018 19:18:10 +0200
Subject: [PATCH] fix #4220

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

diff --git a/lib/wallet.py b/lib/wallet.py
index f5596c9f3..7c20ed55d 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -1531,7 +1531,10 @@ class Abstract_Wallet(PrintError):
                 baseurl = 'file://' + rdir
                 rewrite = config.get('url_rewrite')
                 if rewrite:
-                    baseurl = baseurl.replace(*rewrite)
+                    try:
+                        baseurl = baseurl.replace(*rewrite)
+                    except BaseException as e:
+                        self.print_stderr('Invalid config setting for "url_rewrite". err:', e)
                 out['request_url'] = os.path.join(baseurl, 'req', key[0], key[1], key, key)
                 out['URI'] += '&r=' + out['request_url']
                 out['index_url'] = os.path.join(baseurl, 'index.html') + '?id=' + key