pfSense

The Thermal Sensors widget has code to filter out any sysctl line that contains ' -', but is checking a $negsign variable that doesn't exist instead of the $v that contains the correct string to be checking

$dfout_filtered = array_filter($dfout, function($v) {
    return strpos($negsign, ' -') === false;
});

This is fixed by pull request https://github.com/pfsense/pfsense/pull/4540 and has been tested to work on my install by manually changing this line (I have an ACPI thermal zone that reports a constant -273.1C that no longer shows up in the widget since the change)