Hello thanks for the response. I tried to retire the question but wasn't successfull.
Your fault was already corrected. Different circumstances had as result, that in the sourcecode was standing IGT_MIN_ERROR at different positions instead of IGT_HL_MIN_ERROR. But this wasn't the problem. After running once in the debugging-mode, it ran after without segmentation-fault (without changing the code). I don't know why. Before, I was searching for hours.
