syrnchronizing cell img access generation both on java and python

error-message

Traceback (most recent call last):
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Access is null, returning!
Traceback (most recent call last):
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
Access is null, returning!
Access is null, returning!
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
Traceback (most recent call last):
  File "jnius/jnius_proxy.pxi", line 156, in jnius.invoke0
  File "jnius/jnius_proxy.pxi", line 124, in jnius.py_invoke0
AttributeError: 'dict' object has no attribute 'invoke'
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x000056358a7a46fe, pid=52005, tid=0x00007fb5e4b63700
#
# JRE version: OpenJDK Runtime Environment (8.0_232-b09) (build 1.8.0_232-b09)
# Java VM: OpenJDK 64-Bit Server VM (25.232-b09 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# C  [python+0x1096fe]  PyObject_Malloc+0x5e
#
# Core dump written. Default location: /home/hanslovskyp/workspace/hackathon-dresden-2019/python/imglyb/examples/core or core.52005
#
# An error report file with more information is saved as:
# /home/hanslovskyp/workspace/hackathon-dresden-2019/python/imglyb/examples/hs_err_pid52005.log
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
# The crash happened outside the Java Virtual Machine in native code.
# See problematic frame for where to report the bug.
#

Process finished with exit code 134 (interrupted by signal 6: SIGABRT)