@@ -137,7 +137,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)

 static av_cold void uninit(AVFilterContext *ctx)

 {

     BufferSourceContext *s = ctx->priv;

-    while (av_fifo_size(s->fifo)) {

+    while (s->fifo && av_fifo_size(s->fifo)) {

         AVFilterBufferRef *buf;

         av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);

         avfilter_unref_buffer(buf);