Openfire meetings error occurs when people connects

Hi,
if people connects to ofmeet room, they get this error ;

Oops! Something went wrong. The following error occurred: OperationError: Failed to execute ‘setRemoteDescription’ on ‘RTCPeerConnection’: Failed to parse SessionDescription. a=fingerprint:null Failed to create fingerprint from the digest.

and i get;

Oops! Something went wrong. The following error occured TypeError: Unable to get property ‘iceUfrag’ of undefined or null reference

can you help me?

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