Unexpected token < in JSON at position 0

Support
#1

Hi!

I use Contact Form 7 on my contact page. It worked fine a week ago but now I get this error message when pushing the send (Skicka meddelande) button:

Unexpected token < in JSON at position 0

The message gets sent and I receive it in my Inbox, but the user on the website does not get a confirmation message that his message has been sent. Usually a green box shows with “Thank you for your message!” like expected.

What could be the problem?

#2

Hey @markusp80,

A plugin or customization might be conflicting. Please try testing for a plugin conflict. You can do this by deactivating all third party plugins, and seeing if the problem remains. If it’s fixed, you’ll know a plugin caused the problem, and you can narrow down which one by reactivating them one at a time.

Thanks.

#3

Hi!

I searched and looked around a bit and I know that’s your “standard answer” for questions like this and it’s not very helpful. The plugins I have installed I need for the website to function properly.

Could you please try and send a message via the contect form and see what happens?

#4

Hi there,

Please provide the URL to the site you are referring to so that we could test it.

Thank you.

#5

Sorry, I missed to include that in my first post.

It is http://www.markusp.se/kontakt/

#6

I tested the form and there’s a success message. Try clearing your browser cache or try incognito mode.

Regarding my previous answer, yes that is a standard answer because we don’t really know exactly what is causing the issue based on the first information provided. And, Unexpected token < in JSON at position 0 relates to JavaScript so you first need to test for a conflict.

Thanks.

#7

Now it works for me too, both normal mode and incognito.

When I started the ticket this morning I was at work, now I tried from my home network. Could it have something to do with firewalls or something? The reason why I checked it out was because I got 7 messages in my Inbox last night sent from the contact form that were identical yesterday, probably from a visitor on my website that filled in the form and then pressed the button several times because he only saw that unexcpected token message.

Oh well, it works fine now : )

#8

Hi There,

I tried your contact form a couple of times and was not able to encounter the said error. Most of the time inconsistent error like this is related to a caching. Please clear all caching feature/plugin your site might have (I see your site is under CloudFlare).

Also, do you have a browser add-ons in your office (work) PC that is not on your home PC? That is also worth checking.

Thanks,

#9

Hi!

Ok, yes caching is often the problem. I got the messages you sent from John Doe etc. Now I am back at work and tried the contact form from the exact same computer and location, no problems!

I also got an automatic update to Wordpress 4.9.2. All my plugins are up to date as well. So my problem is solved. Thanks!

#10

If you need anything else please let us know.

#11

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