Question on the cause of the exception "Attempting to check install status before application activation"

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Using C5, "Attempting to check install status before application activation" was confirmed on the server.
I'm asking you because I can't find out where the problem comes from. Site operations seem to be fine. Does anybody know if it's installed?

An error occurs here "/concrete/src/Application/Application.php"
public function isInstalled()
    {
        if ($this->installed === null) {
            if (!$this->isShared('config')) {
                throw new \Exception('Attempting to check install status before application initialization.');
            }
            $this->installed = $this->make('config')->get('concrete.installed');
        }
        return $this->installed;
    }


Thanks.