Prevent Project Administrators from changing the Project Key

import com.atlassian.bitbucket.event.project.ProjectModificationRequestedEvent
import com.atlassian.sal.api.component.ComponentLocator
import com.atlassian.sal.api.user.UserManager
import com.atlassian.sal.api.user.UserKey

def userManager = ComponentLocator.getComponent(UserManager)
def currentEvent = event as ProjectModificationRequestedEvent

if (!userManager.isAdmin(new UserKey(currentEvent.user.name)) && currentEvent.isKeyChanged()) {
    currentEvent.cancel("You do not have the correct permissions to change the Project Key.")
}