Cannot convert to Unified Plan

I am trying to create a p2p communication over chrome and firefox. I got an error exception while us ~interop.toUnifiedPlan. Below is some of my resource:

chrome(Version 68.0.3440.106 (Official Build) (64-bit)) create offer with options:

options: {offerToReceiveVideo: 1, offerToReceiveAudio: 1, voiceActivityDetection: true, iceRestart: false}

and got offer like this:

type: offer, sdp: v=0
o=- 8827218701004799662 2 IN IP4 127.0.0.1
s=-
t=0 0
a=group:BUNDLE audio video data
a=msid-semantic: WMS 2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW
m=audio 9 UDP/TLS/RTP/SAVPF 111 103 104 9 0 8 106 105 13 110 112 113 126
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:C1os
a=ice-pwd:BVKEK6W6f45+cneHolcrf4CN
a=ice-options:trickle
a=fingerprint:sha-256 86:54:8E:2E:19:4A:BF:43:38:FD:9C:F5:3F:77:60:AF:09:3F:6E:C0:A4:FE:E4:D2:2C:55:61:70:93:4E:3E:1B
a=setup:actpass
a=mid:audio
a=extmap:1 urn:ietf:params:rtp-hdrext:ssrc-audio-level
a=sendrecv
a=rtcp-mux
a=rtpmap:111 opus/48000/2
a=rtcp-fb:111 transport-cc
a=fmtp:111 minptime=10;useinbandfec=1
a=rtpmap:103 ISAC/16000
a=rtpmap:104 ISAC/32000
a=rtpmap:9 G722/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:106 CN/32000
a=rtpmap:105 CN/16000
a=rtpmap:13 CN/8000
a=rtpmap:110 telephone-event/48000
a=rtpmap:112 telephone-event/32000
a=rtpmap:113 telephone-event/16000
a=rtpmap:126 telephone-event/8000
a=ssrc:3020400816 cname:9OgctryAB3v2cYP5
a=ssrc:3020400816 msid:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW 044c9071-5351-486b-b200-734567cbf604
a=ssrc:3020400816 mslabel:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW
a=ssrc:3020400816 label:044c9071-5351-486b-b200-734567cbf604
m=video 9 UDP/TLS/RTP/SAVPF 96 97 98 99 100 101 102 123 127 122 125 107 108 109 124
c=IN IP4 0.0.0.0
a=rtcp:9 IN IP4 0.0.0.0
a=ice-ufrag:C1os
a=ice-pwd:BVKEK6W6f45+cneHolcrf4CN
a=ice-options:trickle
a=fingerprint:sha-256 86:54:8E:2E:19:4A:BF:43:38:FD:9C:F5:3F:77:60:AF:09:3F:6E:C0:A4:FE:E4:D2:2C:55:61:70:93:4E:3E:1B
a=setup:actpass
a=mid:video
a=extmap:2 urn:ietf:params:rtp-hdrext:toffset
a=extmap:3 http://www.webrtc.org/experiments/rtp-hdrext/abs-send-time
a=extmap:4 urn:3gpp:video-orientation
a=extmap:5 http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions-01
a=extmap:6 http://www.webrtc.org/experiments/rtp-hdrext/playout-delay
a=extmap:7 http://www.webrtc.org/experiments/rtp-hdrext/video-content-type
a=extmap:8 http://www.webrtc.org/experiments/rtp-hdrext/video-timing
a=sendrecv
a=rtcp-mux
a=rtcp-rsize
a=rtpmap:96 VP8/90000
a=rtcp-fb:96 goog-remb
a=rtcp-fb:96 transport-cc
a=rtcp-fb:96 ccm fir
a=rtcp-fb:96 nack
a=rtcp-fb:96 nack pli
a=rtpmap:97 rtx/90000
a=fmtp:97 apt=96
a=rtpmap:98 VP9/90000
a=rtcp-fb:98 goog-remb
a=rtcp-fb:98 transport-cc
a=rtcp-fb:98 ccm fir
a=rtcp-fb:98 nack
a=rtcp-fb:98 nack pli
a=rtpmap:99 rtx/90000
a=fmtp:99 apt=98
a=rtpmap:100 H264/90000
a=rtcp-fb:100 goog-remb
a=rtcp-fb:100 transport-cc
a=rtcp-fb:100 ccm fir
a=rtcp-fb:100 nack
a=rtcp-fb:100 nack pli
a=fmtp:100 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42001f
a=rtpmap:101 rtx/90000
a=fmtp:101 apt=100
a=rtpmap:102 H264/90000
a=rtcp-fb:102 goog-remb
a=rtcp-fb:102 transport-cc
a=rtcp-fb:102 ccm fir
a=rtcp-fb:102 nack
a=rtcp-fb:102 nack pli
a=fmtp:102 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=42e01f
a=rtpmap:123 rtx/90000
a=fmtp:123 apt=102
a=rtpmap:127 H264/90000
a=rtcp-fb:127 goog-remb
a=rtcp-fb:127 transport-cc
a=rtcp-fb:127 ccm fir
a=rtcp-fb:127 nack
a=rtcp-fb:127 nack pli
a=fmtp:127 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=4d0032
a=rtpmap:122 rtx/90000
a=fmtp:122 apt=127
a=rtpmap:125 H264/90000
a=rtcp-fb:125 goog-remb
a=rtcp-fb:125 transport-cc
a=rtcp-fb:125 ccm fir
a=rtcp-fb:125 nack
a=rtcp-fb:125 nack pli
a=fmtp:125 level-asymmetry-allowed=1;packetization-mode=1;profile-level-id=640032
a=rtpmap:107 rtx/90000
a=fmtp:107 apt=125
a=rtpmap:108 red/90000
a=rtpmap:109 rtx/90000
a=fmtp:109 apt=108
a=rtpmap:124 ulpfec/90000
a=ssrc-group:FID 1641676001 10430605
a=ssrc:1641676001 cname:9OgctryAB3v2cYP5
a=ssrc:1641676001 msid:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW bdec83f5-63e3-4561-a001-5acb36d5248a
a=ssrc:1641676001 mslabel:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW
a=ssrc:1641676001 label:bdec83f5-63e3-4561-a001-5acb36d5248a
a=ssrc:10430605 cname:9OgctryAB3v2cYP5
a=ssrc:10430605 msid:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW bdec83f5-63e3-4561-a001-5acb36d5248a
a=ssrc:10430605 mslabel:2CFneQPyAjhJEu8xSCECZHNzFnd1mhF1scaW
a=ssrc:10430605 label:bdec83f5-63e3-4561-a001-5acb36d5248a
m=application 9 DTLS/SCTP 5000
c=IN IP4 0.0.0.0
a=ice-ufrag:C1os
a=ice-pwd:BVKEK6W6f45+cneHolcrf4CN
a=ice-options:trickle
a=fingerprint:sha-256 86:54:8E:2E:19:4A:BF:43:38:FD:9C:F5:3F:77:60:AF:09:3F:6E:C0:A4:FE:E4:D2:2C:55:61:70:93:4E:3E:1B
a=setup:actpass
a=mid:data
a=sctpmap:5000 webrtc-datachannel 1024

After that chrome set setLocalDescription, and firefox receive this offer, try to translate to Unified Plan by use peerconnectionAdapter.interop.toUnifiedPlan(description);. Then I got Exception like this:
```
Error: Cannot convert to Unified Plan because m-lines without the rtcp-mux attribute were found.
```

I found that is the application bLine trigger this Exception, this is the bLine :

"{\"rtp\":[],\"fmtp\":[],\"type\":\"application\",\"port\":9,\"protocol\":\"DTLS/SCTP\",\"payloads\":5000,\"connection\":{\"version\":4,\"ip\":\"0.0.0.0\"},\"iceUfrag\":\"C1os\",\"icePwd\":\"BVKEK6W6f45+cneHolcrf4CN\",\"iceOptions\":\"trickle\",\"fingerprint\":{\"type\":\"sha-256\",\"hash\":\"86:54:8E:2E:19:4A:BF:43:38:FD:9C:F5:3F:77:60:AF:09:3F:6E:C0:A4:FE:E4:D2:2C:55:61:70:93:4E:3E:1B\"},\"setup\":\"actpass\",\"mid\":\"data\",\"sctpmap\":{\"sctpmapNumber\":5000,\"app\":\"webrtc-datachannel\",\"maxMessageSize\":1024}}"

I have read the document and I have not find any way to create an Offer which application with rtcp-mux line. I don't know what Can I do. Is this is a bug?

shellscape / webpack-manifest-plugin

Cannot convert to Unified Plan #162