When loading a project with enabled `retrack` PeTrack crashes, due to the following code. When `frame` and `prevFrame` are equal, `dir` becomes 0 which leads to a division by 0, leading to a crash. Example file: `experiments/2021.06.30_Juelich_IEK6H3_EngstelleMultiplePersons/export/cameras/Sequences/cam0/080_l020_h1_p0_a0012_cam0.pet ``` bool applyReTrack = reTrack; if(reTrack) { int dir = (frame - prevFrame); // direction of tracking - forward/backwards dir /= std::abs(dir); // theoretically possible to omit MAX_STEP_TRACK frames constexpr int minQualReco = 90; for(int j = 0; at(i).trackPointExist(frame + j*dir) && at(i).trackPointAt(frame + j*dir).qual() < minQualReco; ++j){ if(at(i).trackPointAt(frame + j*dir).qual() < reQual){ applyReTrack = false; break; } } } ```