From 014c8af560cb2405dce8494c5cc8a5e51def265b Mon Sep 17 00:00:00 2001
From: James Houlahan <james.houlahan@protonmail.com>
Date: Wed, 13 Jan 2021 16:42:10 +0100
Subject: [PATCH] fix: panic when no multipart/alternative children

---
 internal/bridge/release_notes.go | 2 +-
 pkg/message/parser.go            | 8 ++++++--
 unreleased.md                    | 3 +++
 3 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/internal/bridge/release_notes.go b/internal/bridge/release_notes.go
index 534057af..e3a9e2c6 100644
--- a/internal/bridge/release_notes.go
+++ b/internal/bridge/release_notes.go
@@ -1,4 +1,4 @@
-// Copyright (c) 2020 Proton Technologies AG
+// Copyright (c) 2021 Proton Technologies AG
 //
 // This file is part of ProtonMail Bridge.
 //
diff --git a/pkg/message/parser.go b/pkg/message/parser.go
index f32687ad..a77128b9 100644
--- a/pkg/message/parser.go
+++ b/pkg/message/parser.go
@@ -329,8 +329,12 @@ func bestChoice(childParts []parser.Parts, preferredContentType string) parser.P
 		}
 	}
 
-	// Otherwise, choose the last one.
-	return childParts[len(childParts)-1]
+	// Otherwise, choose the last one, if it exists.
+	if len(childParts) > 0 {
+		return childParts[len(childParts)-1]
+	}
+
+	return parser.Parts{}
 }
 
 func allPartsHaveContentType(parts parser.Parts, contentType string) bool {
diff --git a/unreleased.md b/unreleased.md
index 4bde40bf..cb13df47 100644
--- a/unreleased.md
+++ b/unreleased.md
@@ -9,3 +9,6 @@ Changelog [format](http://keepachangelog.com/en/1.0.0/)
 ### Removed
 
 ### Changed
+
+### Fixed
+* GODT-979 Fix panic when trying to parse a multipart/alternative section that has no child sections.