Upstream: Yes, https://gitlab.gnome.org/GNOME/gnome-books/-/commit/504b66f6cec4b7a7bb46ca7a3b27a47ffb6a424b
From 504b66f6cec4b7a7bb46ca7a3b27a47ffb6a424b Mon Sep 17 00:00:00 2001
From: Bastien Nocera <hadess@hadess.net>
Date: Fri, 20 Sep 2019 12:31:35 +0200
Subject: [PATCH] overview: Handle unset documents xdg-user-dir

Don't crash if the documents xdg-user-dir is unset on badly installed
systems.

JS ERROR: Exception in callback for signal: window-mode-changed: Error: Argument 'path' (type filename) may not be null
_addSecondaryLabel@resource:///org/gnome/Books/js/overview.js:308:23

Closes: #39
---
 src/overview.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/overview.js b/src/overview.js
index 18a51f1a..a1b0d246 100644
--- a/src/overview.js
+++ b/src/overview.js
@@ -305,6 +305,8 @@ const EmptyResultsBox = new Lang.Class({
             let docsPath, docsUrl;
 
             docsPath = GLib.get_user_special_dir(GLib.UserDirectory.DIRECTORY_DOCUMENTS);
+            if (!docsPath)
+                docsPath = GLib.get_home_dir();
             docsUrl = Gio.file_new_for_path(docsPath).get_uri();
             useMarkup = true;
             /* translators: %s is the location of the Documents folder.*/
-- 
2.24.1