From baa3b51b3e576a07b0bb1abfc8473a678e175b79 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 5 Jan 2026 08:30:30 +0000
Subject: [PATCH] Do not use client if there isn't one, GitHub issue 4789.

---
 format.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/format.c b/format.c
index ec55fc91..6628ef20 100644
--- a/format.c
+++ b/format.c
@@ -4460,7 +4460,9 @@ format_loop_sessions(struct format_expand_state *es, const char *fmt)
 	for (i = 0; i < n; i++) {
 		s = l[i];
 		format_log(es, "session loop: $%u", s->id);
-		if (active != NULL && s->id == ft->c->session->id)
+		if (active != NULL &&
+		    ft->c != NULL &&
+		    s->id == ft->c->session->id)
 			use = active;
 		else
 			use = all;