Repository: opencv
Issue: OpenCV Error: Assertion failed (isIdentity(expr)) in _InputArray ,matrix_expressions.cpp, line 1843
Labels: incomplete,needs reproducer

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##### System information (version)
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- OpenCV => 3.4.16
- Operating System / Platform =>ubunut18.4
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- OpenCV => :grey_question:
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##### Detailed description

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OpenCV Error: Assertion failed (isIdentity(expr)) in _InputArray, file /home/XXX/Music/opencv-3.4.16/modules/core/src/matrix_expressions.cpp, line 1843
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/XXX/Music/opencv-3.4.16/modules/core/src/matrix_expressions.cpp:1843: error: (-215) isIdentity(expr) in function _InputArray

bash: line 1: 31745 Aborted   

##### Steps to reproduce

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