Exception in Tkinter callback

Matplotlib 1.1.0 on Ubuntu 11.04

If MPL backand is set to TkAgg, drawing window dialog appears without plot content, and then after closing it, this error is thrown:

···

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Exception in Tkinter callback
Traceback (most recent call last):

File “/usr/lib/python2.7/lib-tk/Tkinter.py”, line 1413, in call
return self.func(*args)

File “/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py”, line 236, in resize
self.show()

File “/usr/local/lib/python2.7/dist-packages/matplotlib/backends/backend_tkagg.py”, line 240, in draw
tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)

File “/usr/local/lib/python2.7/dist-packages/matplotlib/backends/tkagg.py”, line 19, in blit
tk.call(“PyAggImagePhoto”, photoimage, id(aggimage), colormode, id(bbox_array))

TclError

Is this known, or maybe something is wrong at my side?