Could I get some assistance as I'm driving myself crazy with this one. When I click on the 'Preview' icon in Prismic I am taken to the server and I see various url params, but just get an "Internal Server Error" 500 response. I've followed the docs, as well as the troubleshooting guide, but am sti…

Thanks - in more detail: When developing locally I was holding the prismic token etc within the .env file, which for security reasons is not synced to my git repo. When Vercel performs its build it gets the code from the repo so doesn't have the environment variables. Hence the Error 500. The fix …

Hey Andrzej, I'm guessing you had some cookies that didn't get cleared and are not out of date. If you clear these and start again it should work. The cookies you'll want to clear are: io.prismic.preview _next_preview_data _prerender_bypass Then to make sure this doesn't happen again in the futu…

Thanks Phil - I figured it out, and it was the silliest thing: I'd forgotten to set the environment vars in Vercel. Doh! Might be a good checklist item for your documentation for those that are as forgetful as me...

I'm glad you figured this out. That's a really good catch. I'll definitely update the docs. Would you mind sharing your fix here for anyone who comes across this issue on the forum? Thanks.

Thanks so much for sharing this :slight_smile: This will really help others.

Hey, so I am facing a similar issue. I use next.js on my application and I am receiving 500 Internal Server Errors on my unpublished documents. It works fine for all other documents. I saw that Troubleshooting: Previews provides help here, but adding the toolbar js on my 404 page did not help unfor…

Hi Andreas - Are you using a token that provides access to "Master + Versions" - sounds like you might need that in place...?

Do you mean "Master + Releases"? Currently my token is master only.

Yes, sorry, that's what I was thinking. I don't know for sure that this will solve the problem, but just a thought!

@andreas.kratzel If @andrzej 's suggestion doesn't work, you could send me a ZIP file or git repo containing your project, and I could try to find the source of the problem. Feel free to send it in a DM. Best, Sam

Preview problem - Internal Server Error 500 - #18 by Phil - Developing with Prismic

Topic		Replies	Views	Activity
500 error on preview Developing with Prismic nextjs	3	1393	January 11, 2022
Preview not working on Next.js site Developing with Prismic nextjs	9	1668	January 26, 2022
Next.js - Internal Server Error for previews Developing with Prismic nextjs	12	4297	August 11, 2020
Preview mode cookie missing from non-local environment Developing with Prismic nextjs , preview-cookies	5	277	March 28, 2024
Preview in NextJS on Vercel issue Developing with Prismic nextjs	8	1295	October 14, 2021

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4297

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