Berzerker Challenge Bug

After killing the boss, I switch to web page to check my chat. After few mins, I switch back to Maplesaga, but my character have died. There is no more monster in the berzerker challenge. I didn't get the reward or any exp, plz fix this bug!

 

once you complete killing the ergoth, please get your reward immediately.
do not switch to a webpage to check your chat.

 

so there is a bug

 

That could have been a perfect ring. Rip u