error after update to 2.9.8

I have the same problem. And the form doesn’t submit (no submission shows up) either.
I deactivated all other plug-ins, and the problem still persisted.
I also tried creating a brand new form, and the same problem occurs.

Got a response back from Ninja forms already:
This is a result of your site being on a very old version of PHP. We are adjusting our code to account for this and will release an update shortly. If your site is not operational, you can delete the ‘ninja-forms’ folder from your ‘wp-content/plugins directory’ and it should restore site access. Ninja Forms 2.9.9 will release imminently to resolve this issue. We’re very sorry for the trouble!

Thanks for the quick reply I will wait for an update before reactivating your plugin. My php version is not old though just FYI in fact it is quite recent.

Sorry for the inconvenience!

This should be taken care of in version 2.9.10. We had attempted a fix for some WC3 validation compatibility, but it had some negative consequences. 2.9.10 reverses those changes.

works fine with latest update. Love this plugin. great support. thanks

No problem! We’re currently onboarding new developers, so this one slipped through the cracks!