From 7f2d3c4d1cab33789d32efb539692fda8f4da3a9 Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Sun, 27 Jul 2025 15:47:02 +0200
Subject: [PATCH] 8514/a: Add some sanity checks.

---
 src/video/vid_8514a.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/video/vid_8514a.c b/src/video/vid_8514a.c
index c8191a876..90937d008 100644
--- a/src/video/vid_8514a.c
+++ b/src/video/vid_8514a.c
@@ -334,6 +334,9 @@ ibm8514_accel_out_fifo(svga_t *svga, uint16_t port, uint32_t val, int len)
 {
     ibm8514_t *dev = (ibm8514_t *) svga->dev8514;
 
+    if (dev == NULL)
+        return;
+
     if (port & 0x8000) {
         if ((port != 0xe2e8) && (port != 0xe2e9) && (port != 0xe6e8) && (port != 0xe6e9)) {
             if (port & 0x4000)
@@ -743,6 +746,9 @@ ibm8514_accel_out(uint16_t port, uint32_t val, svga_t *svga, int len)
 {
     ibm8514_t *dev = (ibm8514_t *) svga->dev8514;
 
+    if (dev == NULL)
+        return;
+
     if (port & 0x8000) {
         if (dev->accel.cmd_back) {
             dev->fifo_idx++;
@@ -777,6 +783,9 @@ ibm8514_accel_in_fifo(svga_t *svga, uint16_t port, int len)
     uint16_t temp = 0;
     int      cmd  = 0;
 
+    if (dev == NULL)
+        return 0xffff;
+
     switch (port) {
         case 0x82e8:
             if (len == 2)