Moving hand fast cause [handdetector-7] process to die

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I've successfully run MIT's hand detection demo. However, the recognized hand in rviz will stopped moving, if my hand moves a little faster. It's because the [handdetector-7] process died. As long as I kept my hand moving slow, the package runs fine. Complete error message:

detectskelhands: /usr/include/eigen3/Eigen/src/Core/Block.h:278: Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel, true>::Block(XprType&, Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel, true>::Index) [with XprType = Eigen::Matrix<float, 3, 3>, int BlockRows = 3, int BlockCols = 1, bool InnerPanel = true, Eigen::Block<XprType, BlockRows, BlockCols, InnerPanel, true>::Index = int]: Assertion `(i>=0) && ( ((BlockRows==1) && (BlockCols==XprType::ColsAtCompileTime) && i<xpr.rows()) ||((BlockRows==XprType::RowsAtCompileTime) && (BlockCols==1) && i<xpr.cols()))' failed.

got hand 0.19, 0.240678, 0.765086 [handdetector-7] process has died [pid 3817, exit code -6].

Does this happen to anyone of you?