MATLAB: Do I get the error “Invalid or deleted object.” for the following code

polarplotpolarscatter

When I run the code for the first time, I get this error. However when I run it for a second time my code is able to run through to completion.
start = pi;points = 250; % decrease to increase speed of markerend_ = 0;disc = pi/16;theta = linspace(pi,0,points);rho = sin(theta);theta2 = linspace(0,pi,points);rho2 = -sin(theta2);p = polarscatter(theta(1),rho(1),'o','Filled','red');for i = 0:15    interval = linspace(start+i*disc,end_+i*disc,points);    interval2 = linspace(end_+i*disc,start+i*disc,points);    polarplot(interval,rho)    hold on    for k = 2:length(interval)        p.XData = interval(k);        p.YData = rho(k);        drawnow     end    pause(0.1)    polarplot(interval2,rho2)    for k = 2:length(interval2)        p.XData = interval2(k);        p.YData = rho2(k);        drawnow    end    pause(0.1)enddisp('Finished.')

p = polarscatter(theta(1),rho(1),'o','Filled','red');ph = p.Parent; %axis handle hold(ph, 'on')
polarplot(ph,interval,rho)