From d1abd788d0b22de1d8165b01b8c69eb6cb1ccd2d Mon Sep 17 00:00:00 2001
From: Christian Soffke <christian.soffke@gmail.com>
Date: Thu, 23 Apr 2026 14:15:46 +0200
Subject: [PATCH] pcm_mixer: fix missing NULL check for play_cbs

Fixes Metronome plugin crashing
(regression introduced in cb04b81)

Does *not* fix missing Metronome sound
(regression introduced in 017dd72)

Change-Id: I1da9aa2c937b267a3d5b122c431eaa9f7e748440
---
 firmware/pcm_mixer.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/firmware/pcm_mixer.c b/firmware/pcm_mixer.c
index fb12e53373..607db70839 100644
--- a/firmware/pcm_mixer.c
+++ b/firmware/pcm_mixer.c
@@ -163,7 +163,7 @@ fill_frame:
 
         if (chan->size == 0)
         {
-            if (chan->play_cbs->get_more)
+            if (chan->play_cbs && chan->play_cbs->get_more)
             {
                 chan->play_cbs->get_more(&chan->start, &chan->size);
                 ALIGN_AUDIOBUF(chan->start, chan->size);