Going through the steps again I’m finding that it only triggers when saving an existing Grid field which already had the Toggle column. It saves fine when you first add the new Toggle column to a Grid.
I do have add-ons installed, but I just tested this on two separate installs of 3.4.0, with different sets of add-ons installed.
Ah yes I see what’s happening now. It’s not a fatal PHP error, just a notice, so it was hidden by the redirect. I think it’s been that way for a while, but doesn’t look like it’s made anything functionally broken. Curious, how did you come across this? Did you happen to halt execution before it could redirect?
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