Not properly handled comma-separated value in ACP can cause fatal errors. For example, if Allowed schemes in links setting is empty * or contains * non-comma separators and/or trailing characters, it causes fatal error like:
Fatal error: Uncaught InvalidArgumentException: Invalid scheme name '' in [ROOT]/vendor/s9e/text-formatter/src/Configurator.php:8443
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or
Fatal error: Uncaught InvalidArgumentException: Invalid scheme name '' in [ROOT]/vendor/s9e/text-formatter/src/Configurator/Collections/SchemeList.php:38
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Example support topics:
https://www.phpbb.com/community/viewtopic.php?p=15011511
https://www.phpbb.com/community/viewtopic.php?p=14957461#p14957461
https://www.phpbb.com/community/viewtopic.php?p=15321631#p15321631
and some more.