Bonjour publish error at TicksAndRejections

[RichardFoss]

Hi, I have created a server application, that uses bonjour.publish(ops).
I build the application with the help of webpack. The application runs fine, but I get this error message logged about every second:

internal/process/task_queues.js:80 Uncaught TypeError: undefined is not a function
at
at processTicksAndRejections (internal/process/task_queues.js:80)

Any ideas about what this message might derive from? When I comment out the bonjour.publish(opt) statement, the message does not appear.