gst_buffer_unref fails on appsink callback for local variables

[ign bra]

Hello folks, I am playing with appsink and try to get buffer from appsink. 
This part OK.
Problem is when I do cleaning. GstBuffer fails to unref after pull:

static GstFlowReturn gstre_pull_sample_cb(GstElement* gstappsink,
                                          gpointer data){
    GstSample* sample;
    GstBuffer* buffer;
    GstCaps* caps;
    g_signal_emit_by_name (gstappsink, "pull-sample", &sample);
    if (sample) {
      buffer = gst_sample_get_buffer(sample);
      caps = gst_sample_get_caps(sample);
      gst_buffer_unref(buffer);
      g_print ("*");
      gst_sample_unref(sample);
    }


    return GST_FLOW_OK;
}

I think I am missing something trivial about memory managment, because unref
call simply fails for buffer push:

** (GstReencoderTest:1624): CRITICAL **: gst_video_frame_map_id: assertion
'GST_IS_BUFFER (buffer)' failed

(GstReencoderTest:1624): GStreamer-CRITICAL **: gst_pad_push: assertion
'GST_IS_BUFFER (buffer)' failed

(GstReencoderTest:1624): GStreamer-CRITICAL **: gst_mini_object_unref:
assertion 'mini_object->refcount > 0' failed

How to properly release buffer in callback, I seem to fail and overunref it,
I don't know how.



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