[SimpleResultsTable module] Input is not proper UTF-8, indicate encoding

Is this a bug in a SimpleResultsTable module?

For example a dashboard:

/app/Splunk_for_ActiveDirectory/secrpt_account_all

[SimpleResultsTable module] Input is not proper UTF-8, indicate encoding ! Bytes: 0xE9 0x3C 0x2F 0x74, line 16, column 28

In web_service.log:

ERROR   [51933faf7e465c550] module:56 - Input is not proper UTF-8, indicate encoding ! Bytes: 0xE8 0x6B 0x69 0x68, line 74, column 35 Traceback (most recent call last):   File "C:\Program Files\Splunk\Python-2.7\Lib\site-packages\splunk\appserver\mrsparkle\controllers\module.py", line 54, in renderModule
    pageContent = instance.generateResults(**args)   File "C:\Program Files\Splunk\share\splunk\search_mrsparkle\modules\results\SimpleResultsTable.py", line 106, in generateResults
    rs = job.getResults(entity_name, offset, count)   File "C:\Program Files\Splunk\Python-2.7\Lib\site-packages\splunk\search\__init__.py", line 2034, in getResults
    return ResultsLite(serverContent)   File "C:\Program Files\Splunk\Python-2.7\Lib\site-packages\splunk\search\__init__.py", line 1916, in __init__
    raise e XMLSyntaxError: Input is not proper UTF-8, indicate encoding ! Bytes: 0xE8 0x6B 0x69 0x68, line 74, column 35

Is there work around for this issue? In this case for ISO 8859-2 Western and Central Europe character set encoding.