How to fix a segmentation fault: 11 in c++?

Question

I am currently working on a program that takes the mode from an array of numbers using a template function. The code will compile with no problems using g++ on my macOS (ie no errors, warnings, etc.). However when I run the code I get this output in the terminal:

Segmentation fault: 11

Here is the code that I have:

#include <stdexcept>
#include <cstdio>
#include <cstddef>

template<typename T>
T mode(const T* values, size_t length) {
    if (length < 0) throw std::out_of_range{ 0 };
    T result{};
    int number = values[0];
    int count = 1; 
    int countMode = 1;

    for (int i = 1; i < length; i++) {
        if (values[i] == number) {
            countMode++;
        }
        else {
            if (count > countMode) {
                countMode = count;
                result = number;
            }
            count = 1;
            number = values[i];
         }
    }

    if (sizeof(result) > 1) throw std::range_error{ 0 };
    else {
        return result;
    }
 }

int main() {
   const int arr[] = { 1, 4, 1, 2, 7, 1, 2, 5, 3, 6 };
   int arr_size = sizeof(arr) / sizeof(arr[0]);
   const auto result = mode<int>(arr, arr_size);
   printf("Mode = %d\n", result);
}

I got part of my code here

The expected output is this:

"Mode = 1"

Answer 1

I got that error (not a segmentation fault)

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_S_construct null not valid

So

 if (sizeof(result) > 1) throw std::range_error{ 0 };
    else {
        return result;
    }
 }

is what causes the problem because sizeof(result) returns 4 for int result , hence the exception is thrown and there is no catcher.