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It seems like icy2003\php\I::get($json, $this->_qq . '.6') can also be of type false; however, parameter $string of icy2003\php\ihelpers\Charset::toUtf() does only seem to accept string, maybe add an additional type check?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation