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Occasional crashes in cv::CascadeClassifier.detectMultiScale

From time to time I get this exception:

"X:\Dev\git\opencv-2.4\modules\imgproc\src\shapedescr.cpp:799: error: (-201) Number of points should be >= 5 in function CvBox2D cvFitEllipse2(const CvArr*)"

This happens when running opencv on android 4.0.4. We use the latest opencv manager with up to date 2.4.2 neon module.

Any ideas howto avoid this?