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Getting error when trying to edit first post

PHP:

Uncaught TypeError: Cannot read properties of null (reading 'length')
    at c.prepareInput (prefix_menu.min.js?_v=d5c919a4:8:151)
    at c.setupSelect2 (prefix_menu.min.js?_v=d5c919a4:13:90)
    at HTMLSelectElement.i (jquery.min.js:2:88736)
    at HTMLSelectElement.dispatch (jquery.min.js:2:43090)
    at v.handle (jquery.min.js:2:41074)
    at Object.trigger (jquery.min.js:2:71513)
    at HTMLSelectElement.<anonymous>...

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