===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/file.c,v
retrieving revision 1.1
retrieving revision 1.2
diff -u -r1.1 -r1.2
--- src/usr.bin/tmux/file.c	2019/12/12 11:39:56	1.1
+++ src/usr.bin/tmux/file.c	2019/12/12 11:51:32	1.2
@@ -1,4 +1,4 @@
-/* $OpenBSD: file.c,v 1.1 2019/12/12 11:39:56 nicm Exp $ */
+/* $OpenBSD: file.c,v 1.2 2019/12/12 11:51:32 nicm Exp $ */
 
 /*
  * Copyright (c) 2019 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -88,7 +88,7 @@
 	struct client_file	*cf = arg;
 	struct client		*c = cf->c;
 
-	if (cf->cb != NULL && (~c->flags & CLIENT_DEAD))
+	if (cf->cb != NULL && (c == NULL || (~c->flags & CLIENT_DEAD)))
 		cf->cb(c, cf->path, cf->error, 1, cf->buffer, cf->data);
 	file_free(cf);
 }