PHP 7.3 compact() issues an E_NOTICE level error

[MixMe]

Error: compact(): Undefined variable: throwException

PHP 7.3.0 | compact() now issues an E_NOTICE level error if a given string refers to an unset variable. Formerly, such strings have been silently skipped.

ARCANEDEV/LogViewer#234 (comment)

[micaelomota]

I've forked this and fixed this issue https://github.com/congenialbr/yii2-user-management