[TF2] Compile error can't detect if a player is not a miniboss

[Michalplyoutube]

I m keep getting when i try to compile
// D:\TF2Server\server\tf\addons\sourcemod\scrip ting\tf2bwr.sp(3819) : error 028
: invalid subscript (not an array or too many subscripts): "false"

if( IsValidRobot(client) && ( GetEntProp( client, Prop_Data, "m_bIsMiniBoss" ) == _:false )

Anyway to fix it?

[pheadxdll]

if(bool:GetEntProp(client, Prop_Send, "m_bIsMiniBoss") == false)
if(!GetEntProp(client, Prop_Send, "m_bIsMiniBoss"))

[Michalplyoutube]

Thanks