From 35fcf4a4ae5e4c7259111def96aa19a2d5081fc4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Trevisan=20=28Trevi=C3=B1o=29?= <mail@3v1n0.net>
Date: Fri, 20 Oct 2017 02:52:04 -0500
Subject: [PATCH] MetaWindowActor: don't start any effect when no compositor is
 available

There are cases when no compositor is available (yet) but a MetaWindow tries
to start a simple effect using a compositor plugin which is not available.
In that case we should just ignore any request and protect ourselves from
crashes.

https://bugzilla.gnome.org/show_bug.cgi?id=789223
---
 src/compositor/meta-window-actor.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/compositor/meta-window-actor.c b/src/compositor/meta-window-actor.c
index de506aa39..83f6570c8 100644
--- a/src/compositor/meta-window-actor.c
+++ b/src/compositor/meta-window-actor.c
@@ -1076,6 +1076,9 @@ start_simple_effect (MetaWindowActor  *self,
   gint *counter = NULL;
   gboolean use_freeze_thaw = FALSE;
 
+  if (!compositor->plugin_mgr)
+    return FALSE;
+
   switch (event)
   {
   case META_PLUGIN_NONE: