RSSRun time error 11: divide

[MYGO.pl]

Displaying debug trace (plugin "piss.amxx", version "2.0")
[AMXX] Run time error 11: divide
[AMXX] [0] piss.sma::make_pee (line 89)

How to solve this?

PHP Code:

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public make_pee(ids[]) 
{ 
    new id=ids[0]
    new vec[3] 
    new aimvec[3] 
    new velocityvec[3] 
    new length 
    get_user_origin(id,vec) 
    get_user_origin(id,aimvec,3) 
    new distance = get_distance(vec,aimvec) 
    new speed = floatround(distance*1.9)

    velocityvec[0]=aimvec[0]-vec[0] 
    velocityvec[1]=aimvec[1]-vec[1] 
    velocityvec[2]=aimvec[2]-vec[2] 

    length=sqrt(velocityvec[0]*velocityvec[0]+velocityvec[1]*velocityvec[1]+velocityvec[2]*velocityvec[2]) 

    velocityvec[0]=velocityvec[1]*speed/length /// line 89
    velocityvec[1]=velocityvec[2]*speed/length 
    velocityvec[2]=velocityvec[0]*speed/length 


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