diff --git a/gst/vaapi/gstvaapipostproc.c b/gst/vaapi/gstvaapipostproc.c
index bcd25228dd..353c6b1979 100644
--- a/gst/vaapi/gstvaapipostproc.c
+++ b/gst/vaapi/gstvaapipostproc.c
@@ -255,7 +255,7 @@ gst_vaapipostproc_stop(GstVaapiPostproc *postproc)
 static GstFlowReturn
 gst_vaapipostproc_process(GstVaapiPostproc *postproc, GstBuffer *buf)
 {
-    GstVaapiVideoBuffer *vbuf = GST_VAAPI_VIDEO_BUFFER(buf);
+    GstVaapiVideoBuffer *vbuf;
     GstVaapiSurfaceProxy *proxy;
     GstClockTime timestamp;
     GstFlowReturn ret;
@@ -263,6 +263,13 @@ gst_vaapipostproc_process(GstVaapiPostproc *postproc, GstBuffer *buf)
     guint outbuf_flags, flags;
     gboolean interlaced, tff;
 
+    if (GST_VAAPI_IS_VIDEO_BUFFER(buf))
+        vbuf = GST_VAAPI_VIDEO_BUFFER(buf);
+    else if (GST_VAAPI_IS_VIDEO_BUFFER(buf->parent))
+        vbuf = GST_VAAPI_VIDEO_BUFFER(buf->parent);
+    else
+        goto error_invalid_buffer;
+
     flags = gst_vaapi_video_buffer_get_render_flags(vbuf);
 
     /* Deinterlacing disabled, push frame */
@@ -328,6 +335,12 @@ gst_vaapipostproc_process(GstVaapiPostproc *postproc, GstBuffer *buf)
     return GST_FLOW_OK;
 
     /* ERRORS */
+error_invalid_buffer:
+    {
+        GST_ERROR("failed to receive a valid video buffer");
+        gst_buffer_unref(buf);
+        return GST_FLOW_UNEXPECTED;
+    }
 error_create_buffer:
     {
         GST_ERROR("failed to create output buffer");