Exception in wrapper.log: need explanation

In a gateway wrapper.log I find many items like the following:

INFO   | jvm 1    | 2019/05/02 11:11:43 | E [o.a.w.r.c.RequestCycle        ] [09:11:43]: Error during processing error message 
INFO   | jvm 1    | 2019/05/02 11:11:43 | java.lang.IllegalStateException: Header was already written to response!

Any idea about that message?

Thanks in advance, regards

If this messages are logged when accessing the gateway webpages with Firefox it is a known bug that can be ignored. It is a problem in the underlying library.

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Thanks Mr chi. I cannot confirm at the moment that those messages are logged just when I access the gateway webpages with Firefox: I will pay attention at that.