diff -aNur xfce4-session-4.14.0/xfce4-session/xfsm-consolekit.c xfce4-session-4.14.0-my/xfce4-session/xfsm-consolekit.c
--- xfce4-session-4.14.0/xfce4-session/xfsm-consolekit.c	2019-08-11 21:11:06.000000000 +0100
+++ xfce4-session-4.14.0-my/xfce4-session/xfsm-consolekit.c	2019-11-06 17:57:00.986363357 +0000
@@ -155,7 +155,11 @@
       consolekit->proxy = NULL;
     }
 
-  g_object_unref (G_OBJECT (consolekit->screensaver));
+  if (consolekit->screensaver != NULL)
+    {
+      g_object_unref (G_OBJECT (consolekit->screensaver));
+      consolekit->screensaver = NULL;
+    }
 }