Stackoverflow error in set strutctre (GDB)

Currently whenever I try to execute my code I receive a segmentation fault. Debbuging it using GDB I tracked the problem down to the checkConsecutive(), and with some more tests, the set tabooDays.

...insertEarly(...) //What comes previously is not important
    set <int> tabooDays;
    int day, firstSlot;
    for(int i = 0; i < split; i++){
        int roomId; 
        roomToDisc(discId, data, &roomId);
        if(this->checkConsecutive(&day, &firstSlot, splitSize[i], 0, 0, 16, tabooDays, this->teacher[teacherId], this->grade[gradeId],this->room[roomId])){
            tabooDays.insert(day);
            for(int slot = firstSlot; slot < firstSlot + splitSize[i]; slot++){
                this->grade[gradeId].schedule[day][slot] = discId+1;
                this->teacher[teacherId].schedule[day][slot] = discId+1;
                this->room[data->grades[gradeId]->room->id].schedule[day][slot] = discId+1;
                this->room[roomId].schedule[day][slot] = discId+1;
                this->grade[gradeId].discList.insert(discId);
            }
        }else{
            return 1;
        }
    }
    return 0;
}

bool Solution::checkConsecutive(int *day, int *firstSlot, int size, int dayStart, int slotStart, int slotEnd, set<int> tabooDays, Schedule teacher, Schedule grade, Schedule room){
    for(int i = dayStart; i < 6; i++){
        for(int j = slotStart; j <= slotEnd-size && !(tabooDays.count(i)) ; j++){
            if(grade.checkDisponibility(i, j, j+size) && teacher.checkDisponibility(i, j, j+size) && room.checkDisponibility(i, j, j+size)){
                *day = i;
                *firstSlot = j;
                return true;
            }
        }
    }
    for(auto it = tabooDays.begin(); it != tabooDays.end(); it++){
        for(int j = slotStart; j <= slotEnd-size; j++){
            if(grade.checkDisponibility((*it), j, j+size) && teacher.checkDisponibility((*it), j, j+size) && room.checkDisponibility((*it), j, j+size)){
                *day = (*it);
                *firstSlot = j;
                return true;
            }
        }
    }
return false;
}

GDB Error Message:

Starting program: /home/rafflezs/Documentos/IC University Timetable/exe 
Missing separate debuginfos, use: dnf debuginfo-install glibc-2.30-11.fc31.x86_64
Iniciando leitura de dados!
Solução: 1 || Ordered by Teacher

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ef8478 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::basic_string (this=0x7fffffffcdb0, 
   __str=<error reading variable: Cannot access memory at address 0x12d1268>)
   at /usr/src/debug/gcc-9.3.1-2.fc31.x86_64/obj-x86_64-redhat-linux/x86_64-redhat-linux/libstdc++-v3/include/ext/new_allocator.h:83
83        new_allocator(const new_allocator&) _GLIBCXX_USE_NOEXCEPT { }