is one piece episode 156 filler?

The White Berets confront the Straw Hats telling them to pay the immigration fee. However, the Straw Hats refuse to pay, claiming that the fee is too expensive and also they cannot afford that amount of money.

They are still worried that Nami has not returned and ignore the White Berets to discuss how they can get Nami back. Usopp tries to pacify the White Berets by telling the crew to calmly wait for Nami's return and tells the captain of the White Berets, McKinley, to be patient and that they would pay the fee when Nami returns.