Can’t upload attachment in webform in version-12

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attach.js:106 Uncaught TypeError: Cannot read property 'file_url' of null
at s.on_upload_complete (attach.js:106)
at VueComponent.on_success (attach.js:61)
at XMLHttpRequest.r.onreadystatechange (FileUploader.vue?rollup-plugin-vue=script.js:363)