Error in buffer handling while starting popcorn

Installation under ubuntu focal 20.04.2 ends in this error-message while the program starts and keeps on looking for data endlessly:

[33209:33209:0430/] InitializeSandbox() called with multiple threads in process gpu-process.

DevTools listening on ws://
[33189:33197:0430/] CRL – Verification failed.
[33215:33226:0430/] After loading Root Certs, loaded==false: NSS error code: -8018
(node:33239) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.

Obviously the os-buffer-handling changed meanwhile.
Is there anything to do about to make the program working?

Thank You for Your attention

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