diff --git a/usr.bin/tmux/server-fn.c b/usr.bin/tmux/server-fn.c
index 049932b384e..ae94a90abc6 100644
--- a/usr.bin/tmux/server-fn.c
+++ b/usr.bin/tmux/server-fn.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: server-fn.c,v 1.139 2025/09/09 08:49:22 nicm Exp $ */
+/* $OpenBSD: server-fn.c,v 1.140 2025/10/20 07:28:38 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -401,7 +401,7 @@ server_find_session(struct session *s,
 	struct session *s_loop, *s_out = NULL;
 
 	RB_FOREACH(s_loop, sessions, &sessions) {
-		if (s_loop != s && (s_out == NULL || f(s_loop, s_out)))
+		if (s_loop != s && f(s_loop, s_out))
 			s_out = s_loop;
 	}
 	return (s_out);
@@ -410,6 +410,8 @@ server_find_session(struct session *s,
 static int
 server_newer_session(struct session *s_loop, struct session *s_out)
 {
+	if (s_out == NULL)
+		return (1);
 	return (timercmp(&s_loop->activity_time, &s_out->activity_time, >));
 }