What is this error and why did it occur 400,000+ times in a few minutes?

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I was checking my error report and noticed a spike of this error for lasted for about 5 minutes then ended. Clicking on it gives no further info. Does anyone know what it is?

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I searched online, but only found that it was a bug.
https://devforum.roblox.com/t/not-running-script-because-past-shutdown-deadline/392127

They got around it by checking if the game is running on Roblox Studio.

I don’t think this is it because I don’t have anything bound to close, and it it occurring outside of studio