In QM conservation of energy is not absolute because we have uncertainty principle for very small QM fluctuation time you can borrow energy so long as it is not measured or observed.

Please correct me if any stage of this reasoning is wrong.

1. Energy is borrowed from the vacuum energy.

2. Repayment of the energy is to the vacuum.

3. The vacuum is an integral feature of the universe.

4. If it were possible to observe the energy while it was being borrowed, it would not be where classical physics says it should be.

5. At no time does energy leave or enter the universe; therefore, conservation of energy is not violated.

There never was nothing.