2003 YZ450F cylinder head leaking oil

I just bought a used yz450f and noticed some oil on the right hand side of the radiator and it appears to be coming out of the compression release hole in the cylinder head, looks like there should be a plug or the like in the hole....... I am hoping someone can verify. If this is indeed the case is this a common abnomaly? and what you may have used to replug the hole on short notice.

Thanks

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