Invalid free() / delete / delete[] / realloc() with std::shared_ptr

I'm new to using C++ smart pointers. I wanted to use them in one large project I'm working on, but I'm getting the following error:

==21819== Invalid free() / delete / delete[] / realloc()
==21819==    at 0x4838E7B: operator delete(void*) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==21819==    by 0x188692: std::_Sp_counted_ptr<std::vector<double, std::allocator<double> >*, (__gnu_cxx::_Lock_policy)2>::_M_dispose() (shared_ptr_base.h:377)
==21819==    by 0x12F1C9: std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release() (shared_ptr_base.h:155)
==21819==    by 0x12E724: std::__shared_count<(__gnu_cxx::_Lock_policy)2>::~__shared_count() (shared_ptr_base.h:706)
==21819==    by 0x1406D9: std::__shared_ptr<std::vector<double, std::allocator<double> >, (__gnu_cxx::_Lock_policy)2>::~__shared_ptr() (shared_ptr_base.h:1145)
==21819==    by 0x14071B: std::shared_ptr<std::vector<double, std::allocator<double> > >::~shared_ptr() (shared_ptr.h:103)
==21819==    by 0x1CAB5A: myProg::LearningSequence::optimize(myProg::ErrorFunction&, std::basic_ofstream<char, std::char_traits<char> >*) (LearningSequence.cpp:60)
==21819==    by 0x12DD6A: main (myScript_1_2.cpp:107)
==21819==  Address 0xb2b90d8 is 24 bytes inside a block of size 48 alloc'd
==21819==    at 0x4837DBF: operator new(unsigned long) (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==21819==    by 0x1331C8: __gnu_cxx::new_allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> >::allocate(unsigned long, void const*) (new_allocator.h:111)
==21819==    by 0x132BA0: std::allocator_traits<std::allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> > >::allocate(std::allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> >&, unsigned long) (alloc_traits.h:436)
==21819==    by 0x1320E9: std::__allocated_ptr<std::allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> > > std::__allocate_guarded<std::allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> > >(std::allocator<std::_Sp_counted_ptr_inplace<myProg::RandomSolution, std::allocator<myProg::RandomSolution>, (__gnu_cxx::_Lock_policy)2> >&) (allocated_ptr.h:97)
==21819==    by 0x131988: std::__shared_count<(__gnu_cxx::_Lock_policy)2>::__shared_count<myProg::RandomSolution, std::allocator<myProg::RandomSolution>>(std::_Sp_make_shared_tag, myProg::RandomSolution*, std::allocator<myProg::RandomSolution> const&) (shared_ptr_base.h:654)
==21819==    by 0x131206: std::__shared_ptr<myProg::RandomSolution, (__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<myProg::RandomSolution>>(std::_Sp_make_shared_tag, std::allocator<myProg::RandomSolution> const&) (shared_ptr_base.h:1322)
==21819==    by 0x130784: std::shared_ptr<myProg::RandomSolution>::shared_ptr<std::allocator<myProg::RandomSolution>>(std::_Sp_make_shared_tag, std::allocator<myProg::RandomSolution> const&) (shared_ptr.h:360)
==21819==    by 0x12FA99: std::shared_ptr<myProg::RandomSolution> std::allocate_shared<myProg::RandomSolution, std::allocator<myProg::RandomSolution>>(std::allocator<myProg::RandomSolution> const&) (shared_ptr.h:707)
==21819==    by 0x12EE24: std::shared_ptr<myProg::RandomSolution> std::make_shared<myProg::RandomSolution>() (shared_ptr.h:723)
==21819==    by 0x12DB48: main (myScript_1_2.cpp:86)

I'm really confused by this, because there is a std::shared_ptr created on line 86.

85    myProg::LearningSequence learning_sequence( 1e-6, max_number_of_cycles );
86    std::shared_ptr<myProg::LearningMethod> new_learning_method = std::make_shared<myProg::RandomSolution>();
87    learning_sequence.add_learning_method( new_learning_method );

Also, I don't see anything suspicious on the line 107:

learning_sequence.optimize(mse1);

The strangest thing is, that program crashes in the very end of one of the functions called in optimize().

Is there any way to find out, what's happening?

Thank you very much for any advice.