Cirq to qiskit circuit

[vsprasannaa]

I had a qiskit quantum circuit, which needed to be optimised (that is, to reduce gate operations). I used

cirq_circuit = Qiskit.to_cirq(qiskit_circuit)

and carried out optimisation in cirq. Following this, I tried

qusetta_ckt = Cirq.to_qusetta(optimised_cirq_circuit)
qiskit_circuit1 = Qiskit.from_qusetta(qusetta_ckt)

Unfortunately, I ran into this error for the last line:

ValueError: invalid literal for int() with base 10: 'Q(9'

Can someone please help with the issue? Thanks in advance!