Psychopy/Python - access violation reading 0x00000010

I use Win7, PsychoPy version 1.90.2, but the same error is also for 3.0.0b11, Standard Standalone.

When running my experiment, it crashes at certain (variable) point:

Traceback (most recent call last):
  File "C:\Users\Martin\PsychoPy\FingerTTv3\FingerTTv3_lastrun.py", line 356, in <module>
    win.flip()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\window.py", line 684, in flip
    thisStim.draw()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\psychopy\visual\text.py", line 800, in draw
    self._pygletTextObj.draw()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\pyglet\font\text.py", line 557, in draw
    self._layout.draw()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\pyglet\text\layout.py", line 897, in draw
    self._batch.draw()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\pyglet\graphics\__init__.py", line 560, in draw
    func()
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\pyglet\graphics\__init__.py", line 492, in <lambda>
    (lambda d, m: lambda: d.draw(m))(domain, mode))
  File "C:\Program Files (x86)\PsychoPy3\lib\site-packages\pyglet\graphics\vertexdomain.py", line 316, in draw
    glDrawArrays(mode, starts[0], sizes[0])
OSError: exception: access violation reading 0x00000010

Usually 5-7 minutes after the start. I tried multiple runs, reworked whole experiment (3x), tried to isolate the issue. It crashes even when I have only the "trial-feedback" loop, so there should be the issue.

Description of the experiment It has two routines and two loops

Routine: Trial Screen for "Trial" routine

Here, eight text items (digits) are presented, aligned horizontally at precise location. Also, there is one polygon (frame, square shape). The location of the square changes each keypress so it is under next text item (digit), sequentially from right to left and again.

The Position [x,y] of the moving frame set during every repeat from a xlsx file (column with name "Posit"), each trial, the position is updated:

$eval(Posit)

The positions in the xlsx column "Posit" look like this (normalized distances =-1,1):

Posit (-0.42, 0.2) (-0.3, 0.2) (-0.18, 0.2) (-0.06, 0.2) (0.06, 0.2) (0.18, 0.2) (0.3, 0.2) (0.42, 0.2)

The _key_press_ is just to record the pressed key and decide whether it is correct. The last item is a picture, which is present there. Size 709x353pix and 47.7kB.

Reoutine: FB Screen for "FB" routine

The second routine is just a feedback with 0.1s duration. The picture stays the same (to avoid blinking). There is also this moving frame (which just changes color to red). And a bit of code, which is just to omit this red warning when the trial is correct. If not correct, then a variable Error increases by 1

if key_press.corr: continueRoutine = False

else: Error = Error+1

The _trials_Keypress_ loop makes the frame to jump to the positions from xlsx. The second lool trials is just for blocking.

Please, any idea what is wrong? I got such error also in other experiments, sometimes it was enough to rework it or rebuild it again. Thank you!!!