Level Debug - Application - In the Event

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Hi, can anyone shed some light on how to decipher a debug message that appears in the report section of a 5.7 site i've built.

On the report page in the dashboard it shows a 'Debug' level issue. It tells me the Channel is Application and the Message is 'in the event'. That's all it tells me and I am trying to figure out what is causing this debug issue.
The site works perfectly fine and I am can't seem to find any errors.

What is the best way to approach solving this?

Regards

studio108