Hovertool Bokeh "Cannot read property" - hover

Question

My problem is that in Chrome, when I have my cursor on my histogram hover my data, I have this error :
Uncaught TypeError: Cannot read property '0'
There is my code :
hist, edges = np.histogram(data,bins=3000)
plot = quad(
top=hist,
bottom=0,
left=edges[:-1],
right=edges[1:],
fill_color="#036564",
line_color="#033649",
tools="pan,wheel_zoom,box_zoom,reset, hover",
x_range=[-0.5,3.5],
plot_width=1100,
title="",
)
hover = plot.select(dict(type=HoverTool))
hover.tooltips = [('index','$index')]
resources = Resources("inline")
plot_script, plot_div = components(plot, resources)
html_script = mark_safe(encode_utf8(plot_script))
html_div = mark_safe(encode_utf8(plot_div))
figure()
return html_script, html_div
"data" is a array like this :
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1.24,1,1.32,1,2,3]
I tried to add a "source" in the quad, changed the figure, changed my code for the one on the documentation but I still have my error.
For information, everything is working very well, except the hover tool.
Indeed, in the "hover box" I want another informations then just "index", but it's just for testing.
Thanks for reading !

Answer 1

Sorry I missed this earlier. You have uncovered a small bug with the hover tool that is particular to quad glyphs. In the mean time you can add hover.snap_to_data = False to get it to work.
Here is a GH issue you can track for the full solution:
https://github.com/bokeh/bokeh/issues/1644
A fix should be in the 0.7.1 release next Monday.
Also BTW, you are using a deprecated API. You should now write code like:
p = figure(...)
p.quad(...)