diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
--- a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.cpp
@@ -178,7 +178,12 @@
   AVHWDeviceContext* hwctx = (AVHWDeviceContext*)mVAAPIDeviceContext->data;
   AVVAAPIDeviceContext* vactx = (AVVAAPIDeviceContext*)hwctx->hwctx;
 
-  mDisplay = mLib->vaGetDisplayWl(widget::WaylandDisplayGet()->GetDisplay());
+  wl_display* display = widget::WaylandDisplayGetWLDisplay();
+  if (!display) {
+    FFMPEG_LOG("Can't get default wayland display.");
+    return false;
+  }
+  mDisplay = mLib->vaGetDisplayWl(display);
 
   hwctx->user_opaque = new VAAPIDisplayHolder(mLib, mDisplay);
   hwctx->free = VAAPIDisplayReleaseCallback;
diff --git a/widget/gtk/nsWaylandDisplay.cpp b/widget/gtk/nsWaylandDisplay.cpp
--- a/widget/gtk/nsWaylandDisplay.cpp
+++ b/widget/gtk/nsWaylandDisplay.cpp
@@ -35,6 +35,9 @@
 wl_display* WaylandDisplayGetWLDisplay(GdkDisplay* aGdkDisplay) {
   if (!aGdkDisplay) {
     aGdkDisplay = gdk_display_get_default();
+    if (!aGdkDisplay || GDK_IS_X11_DISPLAY(aGdkDisplay)) {
+      return nullptr;
+    }
   }
 
   // Available as of GTK 3.8+
@@ -537,8 +540,7 @@
          StaticPrefs::widget_wayland_dmabuf_webgl_enabled();
 }
 bool nsWaylandDisplay::IsDMABufVAAPIEnabled() {
-  return IsDMABufEnabled() &&
-         StaticPrefs::widget_wayland_dmabuf_vaapi_enabled();
+  return StaticPrefs::widget_wayland_dmabuf_vaapi_enabled();
 }
 
 void* nsGbmLib::sGbmLibHandle = nullptr;