is one piece episode 240 filler?

In his room and still holding a gun to Luffy, Iceburg demands Luffy to bring Robin to him. However, Luffy says that is impossible as he doesn't even know where Robin is himself.

Suddenly, a gun shot is fired off and the other shipwrights of Water 7 rush over to Iceburg's room. As the shipwrights enter, it is revealed that Iceburg indeed fired the shot but Luffy had already gotten away.

Iceburg then tells the shipwrights to arrest all of the Straw Hat Pirates losing all hope for a direct answer.