From 46c5f9c0ccb053656dee94bf28b95f5b2e0ec8ed Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Mon, 18 Dec 2023 22:33:15 +0100
Subject: [PATCH] Added a missing sanity check to device/isapnp.c, fixes crash
 with ISA PnP sound cards on the PB520R.

---
 src/device/isapnp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/device/isapnp.c b/src/device/isapnp.c
index 7b9d570bb..f9d10b380 100644
--- a/src/device/isapnp.c
+++ b/src/device/isapnp.c
@@ -124,7 +124,7 @@ static void
 isapnp_device_config_changed(isapnp_card_t *card, isapnp_device_t *ld)
 {
     /* Ignore card if it hasn't signed up for configuration changes. */
-    if (!card->config_changed)
+    if ((card == NULL) || !card->config_changed)
         return;
 
     /* Populate config structure, performing endianness conversion as needed. */