This is a patch downgraded from
https://src.fedoraproject.org/rpms/xorg-x11-server/raw/rawhide/f/0001-present-Check-for-NULL-to-prevent-crash.patch
to fix a crash in NVIDIA-495.46 (and later): https://gitlab.freedesktop.org/xorg/xserver/-/issues/1275

--- xorg-server-1.19.7/present/present.c.orig	2019-02-02 10:35:15.000000000 +0000
+++ xorg-server-1.19.7/present/present.c	2022-11-11 11:29:27.266755642 +0000
@@ -255,6 +255,9 @@
     if (!screen_priv->info)
         return NULL;
 
+    if (!screen_priv->info->get_crtc)
+        return NULL;
+
     return (*screen_priv->info->get_crtc)(window);
 }
 
@@ -300,6 +303,9 @@
     if (!screen_priv->info)
         return;
 
+    if (!screen_priv->info->flush)
+        return;
+
     (*screen_priv->info->flush) (window);
 }