dtlssrtpenc return g_hash_table_lookup: assertion 'hash_table != NULL' failed

[Hau Lam]

I tried to use element as guideline in
https://github.com/GStreamer/gst-plugins-bad/commit/79f9c7671ba5daccd8da3c7e4722f24e09680287

my pipeline is "gst-launch-1.0 filesrc location = ./BigBuckBunny.h264 !
h264parse ! video/x-h264,stream-format=byte-stream,alignment=nal !
rtph264pay ! application/x-rtp ! .rtp_sink_0 dtlssrtpenc connection-id=123
is-client=true .src ! udpsink host=127.0.0.1 port=5000"

but I got the error below
Setting pipeline to PAUSED ...

(gst-launch-1.0:285843): GLib-CRITICAL **: 14:39:38.477:
g_hash_table_lookup: assertion 'hash_table != NULL' failed
ERROR: Pipeline doesn't want to pause.
Setting pipeline to NULL ...
Freeing pipeline ...
------
and my RX pipeline as below
gst-launch-1.0 udpsrc port=5000 ! .sink dtlssrtpdec connection-id=123
.rtp_src ! rtph264depay ! h264parse ! queue ! avdec_h264 ! xvimagesink
sync=false

could Gstreamer team suggest what is wrong here ? and how to
use dtlssrtpenc/dtlssrtpdec properly ?

thank you,
Hau
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