No "current firmware" at RB133

Is it safe to reboot (remote) that routerboard? or first I should “upgrade”?:

[admin@xxxx] > system routerboard print 
       routerboard: yes
             model: "133"
     serial-number: "0FFB01C99640"
  current-firmware: ""
  upgrade-firmware: "2.18"
[admin@xxxx] >

upgrade, then reboot