Yes, unfortunately, it will interrupt your 2017 monthly installments.
You should contact the IRS as soon as possible to have 2018 included because a new balance for 2018 will automatically default your 2017 agreement. This is one of the terms of the installment agreement.
You can call the IRS at 1-800-829-7650 or go to a local office. You can also request an installment agreement at IRS.gov to include all of your outstanding balances.
It is important to have the new tax year included because the collection process will start on the new tax year if it is not added to the agreement.
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