Debug: status_change_end: SC_DANCING is missing skill unit group

[Rebel]

[Debug]: status_change_end: SC_DANCING is missing skill unit group (val1=655682, val2=10543, val3=127, val4=0, timer=491, tid=-1, char_id=151140, map=prontera, x=153, y=170, prev=<none>:0, from=pc.c:10091). Please report this! (#3504)

i got this in console.. how did this happen? or how can i fix this???