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I cannot see any problems in your code. The issue have to be related to calling free/delete on a pointer more than once (as the error message states).

You should use a debugger (with the -g flag) to step through your code. When the glibc detects your invalid free call, the debugger halts and you can inspect the backtrace. Hopefully, the backtrace gives you more information about your problem.

However, this problem does not seem to be OpenCV-related.

HTH ;-)