local ticksOnGround, onGround, inAir = {}, {}, {}
 
hook.Add ("Move", "CrouchBugFix", function( ply, data )
	if not IsFirstTimePredicted() then return end
 
    if ply:IsOnGround() then
        if ticksOnGround[ ply ] then
            if ticksOnGround[ ply ] > 12 then
                if not onGround[ ply ] then
                    ply:SetDuckSpeed(0.4)
                    ply:SetUnDuckSpeed(0.2)
 
                    onGround[ ply ] = true
                end
            else
                ticksOnGround[ ply ] = ticksOnGround[ ply ] + 1
 
                if ticksOnGround[ ply ] == 1 then
                    inAir[ ply ] = nil
                elseif ticksOnGround[ ply ] > 1 and data:KeyDown( IN_JUMP ) then
                    local vel = data:GetVelocity()
                    vel.z = ply:GetJumpPower()
 
                    ply:SetDuckSpeed( 0 )
                    ply:SetUnDuckSpeed( 0 )
 
                    ticksOnGround[ ply ] = 0
 
                    data:SetVelocity( vel )
                end
            end
        else
            ticksOnGround[ ply ] = 0
        end
    elseif not inAir[ ply ] then
        ticksOnGround[ ply ] = 0
        onGround[ ply ] = nil
        inAir[ ply ] = true
 
        ply:SetDuckSpeed( 0 )
        ply:SetUnDuckSpeed( 0 )
    end
end )
 
hook.Add ("PlayerDisconnect", "RemoveCrouchBugFix", function( ply )
    ticksOnGround[ ply ] = nil
    onGround[ ply ] = nil
    inAir[ ply ] = nil
end )