Issue after update

Hi,
I Have the same issue on contact form updated site.
I have been using custom theme . Contact form works good on 5.3. but now it’s showing eeror when there is validation error. But validation message ‘one or more field have error’ is not showing now.But sucess message is showing correctly.When seaching many user have problem with latest update. can you tell me what will be cause error message not showing on form submit.

It’s definitely an error in the latest update, i had to rollback to version 5.3.2.
In my website the error happend after trying to submit an empty form.

@edonbajrami have you some custom script for cf7 in your template? can we take a look @ your website?

the errors mentioned above are fired by custom js, in the last week i’ve seen a lot of error like your and all comes from old themes… “Cannot read property ‘querySelector’ of null” means the javascript is looking for a dom element that is never been on the page (most of the time), removed (with js), pointing nothing.

@buildozzer take a look at your javascript for example /wp-content/themes/farm/js/main.js?ver=1.0.0 line 137-153 + 180-194

//// 11. Open Modal Thanks Form Submit
const wpcf7Elm = document.querySelector('.wpcf7');

wpcf7Elm.addEventListener(<code>wpcf7mailsent</code>, function (e) {
.....

//// 13. Validator Form CF7
const inputName = jQuery('form input[type="text"]')

inputName.change(function (e) {
    let colInput = this.value.length,
        idEl = this.id,
        $el = <code>#${idEl}</code>

    if (colInput < 20) {
        jQuery(<code>${$el} form input[type=&quot;submit&quot;]</code>).prop("disabled", true)
        jQuery(<code>${$el} form .wpcf7-response-output</code>).text('Введите корректное ФИО')
        jQuery(<code>${$el} form .wpcf7-response-output</code>).css({ 'display': 'block' })
    } else {
        jQuery(<code>${$el} form input[type=&quot;submit&quot;]</code>).prop("disabled", false)
        jQuery(<code>${$el} form .wpcf7-response-output</code>).text('')
        jQuery(<code>${$el} form .wpcf7-response-output</code>).css({ 'display': 'none' })
    }
})