Threw a grenade at the group of Zil in Pump-king quest

[Cyflan]

Game crashed when I threw a grenade at the zil.

 Version: 0.9.020-BACKER#2535 Message: n is null Stack:
value@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:9869614
value@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:10177854
value@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:10030498
a/<@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:10022605
value@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:16430021
47349/A
value/<@https://www.fenoxo.com/play/TiTS/backer/main.61ee850f.js:1:11042663

Edit: Seems to work fine if I fight them normally, only happens if I try to Grenade them.