A man has been taken hospital after crashing an unregistered motorbike into the back of a police car while drinking a stubby in Victoria overnight.

Police say the motorcycle struck the rear of the unmarked patrol car on Frankston-Flinders Road in Baxter at around 1.45am.

The 45-year-old male rider allegedly tried fleeing after the collision, but collapsed off the bike a short distance away.

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He was taken to hospital with minor injuries and is yet to be interviewed by police.