Unknown type sentfrom ws client

[AlistairFielden]

Getting the following error occurring with a frequency between 1 and 3 minutes. What does this signify. Server was stopping every couple of days or so too. Just done a complete blank install and still getting the errors. Will see if the application continues to crash.

2020-05-16 14:07:32:331+0100 [temperature-http-server-3] DEBUG Unknown type sent from ws client: Close(Array(2))
2020-05-16 14:09:32:289+0100 [temperature-http-server-3] DEBUG Unknown type sent from ws client: Close(Array(2))
2020-05-16 14:10:32:401+0100 [temperature-http-server-1] DEBUG Unknown type sent from ws client: Close(Array(2))
2020-05-16 14:12:32:357+0100 [temperature-http-server-1] DEBUG Unknown type sent from ws client: Close(Array(2))