Vulnerability to Critical Hits

[CanisDirus]

Some entries in the Alien Archive (and at least one in First Contact) list "Vulnerable to Critical Hits" similarly to how robots in Pathfinder (i.e. Iron Gods) did.

Since nothing extra is written in either the Starfinder Core Rulebook or Alien Archive (or First Contact, or the Starfinder Society Guild Guide) about that, should we take this to mean that on a critical hit, these creatures take one-and-a-half times the already-doubled damage? Or is that meant to be one-and-a-half times the critical effect (if the weapon has one)?

This is a question in general and also for Starfinder Society, which also has creatures with the same vulnerabilities listed.

Thanks very much in advance!

[Gary Bush]

Good question. I think 1 and half of the critical effect is what it should be.