I can't figure out this >> Invalid argument: warning

Hi!

I would greatly appreciate if someone can shed some light on the issue which I haven’t been able to figure out for weeks.

Basically, I get this error every time I update a certain content type. It doesn’t happen in other content types.

Warning: Invalid argument supplied for foreach() in DrupalfilePluginFieldFieldWidgetFileWidget->massageFormValues() (line 283 of core/modules/file/src/Plugin/Field/FieldWidget/FileWidget.php).

Any advice is greatly appreciated.

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