System Logs: Error: Undefined constant "IN_DEV" (0) #0 {main}

Any more information in there at all? I can't find anything that would cause this and I can't reproduce it.

I can confirm this occurs on a clean install of Beta 1.

My client had this error twice during the installation of Beta 1.

3 hours ago, Esther E. said:

Any more information in there at all? I can't find anything that would cause this and I can't reproduce it.

There isn't, unfortunately. That's the only information showing up in the System Logs for all of these errors.

Does the screenshot of the most recent error shine any light on this?

Hmmmm. No URL. I wonder if it's triggered by a task. 🤔

That actually does give me a starting point, thanks. 

No worries at all. Please let me know if you need anything else.

Is this still happening?

Thanks for checking, @Esther E.. I have just updated to Beta 4 so will keep an eye on it.

Four days in and I haven't received the error. I'll give it to the weekend and report back, thanks Esther.