Thesis examination - what should I do?

Hey guys,
I am having my degree examination soon where I have to present my thesis. I found out today that I have a wrong figure on the results part in my submitted thesis😭 What should I do at the exam day where I have to present all my results? Should I tell the sensor examiners the truth that I messed up one result because I was tired or should I tell them a lie? What should I do?
Thesis examination - what should I do?
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