Jvb.log / No source SSRC, can't send RTCP

Hi,

my jvb.log is full of this type of messages:

JVB 2020-09-08 13:06:23.118 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.140 WARNING: [177117] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.150 WARNING: [175812] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.250 WARNING: [175724] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.257 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.277 WARNING: [176003] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.280 WARNING: [177117] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.290 WARNING: [175812] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.382 WARNING: [175724] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.401 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.414 WARNING: [176003] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.422 WARNING: [177117] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.436 WARNING: [175812] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.511 WARNING: [175724] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.540 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.542 WARNING: [176003] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.555 WARNING: [175812] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.560 WARNING: [177117] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.650 WARNING: [175724] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.677 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.682 WARNING: [176003] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.690 WARNING: [175812] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.696 WARNING: [177117] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.769 WARNING: [175724] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.796 WARNING: [176003] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.
JVB 2020-09-08 13:06:23.802 WARNING: [175939] org.jitsi.impl.neomedia.rtp.TransportCCEngine.log() No source SSRC, can’t send RTCP.

I am not sure why and what causes this?! Can someone maybe point me in the right direction to get rid of it?