Critical error when submitting form. The default error validation message did not appear

A critical error happens when submitting a form that has empty required fields. The default error validation message did not appear. This problem has occurred since upgrading the Gravity Forms to the 2.7.6 version. Even after I upgraded to the latest 2.7.8 version, this problem was still not solved. There’s no problem before upgrading the form (before 2.7.6).

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