Error on associate milestone to issue

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Hello,

After upgrade gitlab from version 11.8 to latest, I`ve error 500 when associate milestone to one issue.

Screen Shot 2020-03-06 at 10.46.47
Screen Shot 2020-03-06 at 10.46.471258×358 30.1 KB

On Log:

Screen Shot 2020-03-06 at 10.48.59
Screen Shot 2020-03-06 at 10.48.592394×378 75.1 KB

someone had this problem and can help me?

Thanks.