CA Civ Proc Code Section 1710.55

No judgment based on a sister state judgment may be entered pursuant to this chapter in any of the following cases:

(a)

A stay of enforcement of the sister state judgment is currently in effect in the sister state.

(b)

An action based on the sister state judgment is currently pending in any court in this state.

(c)

A judgment based on the sister state judgment has previously been entered in any proceeding in this state.