From a3dcee35f3a7739fb8f3e19d59e9064f696859cc Mon Sep 17 00:00:00 2001
From: Orestis Floros <orestisf1993@gmail.com>
Date: Sun, 9 Sep 2018 16:09:39 +0300
Subject: [PATCH] tree_restore: Check croot

Related to #2414, #3156.
---
 src/tree.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/tree.c b/src/tree.c
index 96766b6a..5a7c5dfa 100644
--- a/src/tree.c
+++ b/src/tree.c
@@ -92,6 +92,10 @@ bool tree_restore(const char *path, xcb_get_geometry_reply_t *geometry) {
 
     DLOG("appended tree, using new root\n");
     croot = TAILQ_FIRST(&(croot->nodes_head));
+    if (!croot) {
+        /* tree_append_json failed. Continuing here would segfault. */
+        goto out;
+    }
     DLOG("new root = %p\n", croot);
     Con *out = TAILQ_FIRST(&(croot->nodes_head));
     DLOG("out = %p\n", out);