From 30201249b539ae75026f7048e6c6e774c57ff015 Mon Sep 17 00:00:00 2001
From: Laurent Cozic <laurent@cozic.net>
Date: Mon, 31 Dec 2018 17:33:20 +0100
Subject: [PATCH] Mobile: Fixes #1068: Handle case where notebook has a parent
 that no longer exists

---
 ReactNativeClient/lib/models/Folder.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ReactNativeClient/lib/models/Folder.js b/ReactNativeClient/lib/models/Folder.js
index 2d055eac40..ad9f5f638d 100644
--- a/ReactNativeClient/lib/models/Folder.js
+++ b/ReactNativeClient/lib/models/Folder.js
@@ -167,7 +167,13 @@ class Folder extends BaseItem {
 			if (!folder.parent_id) {
 				rootFolders.push(folder);
 			} else {
-				idToFolders[folder.parent_id].children.push(folder);
+				if (!idToFolders[folder.parent_id]) {
+					// It means the notebook is refering a folder that doesn't exist. In theory it shouldn't happen
+					// but sometimes does - https://github.com/laurent22/joplin/issues/1068#issuecomment-450594708
+					rootFolders.push(folder);
+				} else {
+					idToFolders[folder.parent_id].children.push(folder);
+				}
 			}
 		}