Can I discontinue PPF contributions in the middle of the 15 years?

[Feroze]

I am holding PPF account for last 6 years and depositing 50000/- every year. Now due to some personal requirement, I am unable to continue the same amount, I have two queries on it -
1- Can I discontinue PPF contributions in the middle of the 15 years?

2- Or do I need to pay Min 500/- this year also?

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