From 14170d60f173e3df2923e1fd1a9ab36860ce2c1b Mon Sep 17 00:00:00 2001
From: Guido Günther <agx@sigxcpu.org>
Date: Sat, 28 May 2022 16:40:48 +0200
Subject: dch: Don't crash when we fail to get an upstream version

Closes: #879495
---
 gbp/scripts/dch.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/gbp/scripts/dch.py b/gbp/scripts/dch.py
index 325a0372..ff4fb95c 100644
--- a/gbp/scripts/dch.py
+++ b/gbp/scripts/dch.py
@@ -50,6 +50,9 @@ def guess_version_from_upstream(repo, upstream_tag_format, upstream_branch, cp=N
                                                     upstream_branch,
                                                     epoch=epoch,
                                                     debian_release=False)
+        if version is None:
+            gbp.log.warn("Failed to find upstream version tag")
+            return None
         gbp.log.debug("Found upstream version %s." % version)
         if compare_versions(version, cmp_version) > 0:
             return "%s-1" % version
-- 
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