Negative data ignored in adding errorbars to plot with logarithmic y axis

I have two sets of data which I am trying to plot with error bars. When I plot the data, the error bars do not plot fully (see image).

"Warning: Negative data ignored"

Here are my data sets:

x=2:8;

y1=[84 4.5e3 3.1e4 5.3e4 1.1e5 1.05e5 6.5e3];

y2=[.22 .07 .14 .2 .07 .02 .27];

y1stderr=[.28 410 7.7e3 3.4e5 4.15e4 5.5e4 3.1e5];

y2stderr=[0.24 .15 .14 .08 .23 .28 .18];

figure

hold on

plot(x,y1,'b',x,y2,'r')

errorbar(x,y1,y1stderr,'b')

errorbar(x,y2,y2stderr,'r')

set(gca,'YScale','log')

axis([0, 8, .001, 500000])

I imagine the problem is with plotting an imaginary component of the errorbar. How do I get around this?