From 2298ee015fcf61c75b4d8dc9015ca13272d7d944 Mon Sep 17 00:00:00 2001
From: Mehdi Abaakouk <sileht@sileht.net>
Date: Thu, 1 Apr 2021 19:43:23 +0200
Subject: [PATCH] fix: don't fail to retrieve branch protection if branch is
 gone

Fixes MERGIFY-ENGINE-255
---
 mergify_engine/actions/merge_base.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mergify_engine/actions/merge_base.py b/mergify_engine/actions/merge_base.py
index 78d37f11c1..ef3ca2e5ed 100644
--- a/mergify_engine/actions/merge_base.py
+++ b/mergify_engine/actions/merge_base.py
@@ -142,7 +142,10 @@ async def _get_queue_summary(
     async def _get_branch_protection_conditions(
         ctxt: context.Context,
     ) -> typing.List[filter.Filter]:
-        branch = await ctxt.repository.get_branch(ctxt.pull["base"]["ref"])
+        try:
+            branch = await ctxt.repository.get_branch(ctxt.pull["base"]["ref"])
+        except http.HTTPNotFound:
+            return []
         if not branch["protection"]["enabled"]:
             return []
         return [