C: Invalid Memory Access

I am new to C arrays and I am facing a problem that my code returns an error of invalid memory access.

Here is the exact error:

"Caught unexpected signal: SIGSEGV (11). Invalid memory access."

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Here is my code:

#include <stddef.h>

int factorial(int x) {               
    if (x == 0 || x == 1) {
        return 1;
    }
    else {
        return x * factorial(x - 1);
    }
}

unsigned long long sum_factorial(size_t z, const int array[z]) {
    unsigned long long result = 0;
    
   for (size_t i = 0; i < z; ++i) {
       result = result + factorial(array[z]);  
   }
   
   return result;
}

>Solution :

**small mistake in above code please replace array[z] with array[i] inside for loop ** Below I mentioned correct code please refer it.

#include <stddef.h>

int factorial(int x) {
    if (x == 0 || x == 1) {
        return 1;
    } else {
        return x * factorial(x - 1);
    }
}

unsigned long long sum_factorial(size_t z, const int array[z]) {
    unsigned long long result = 0;

    for (size_t i = 0; i < z; ++i) {
        result = result + factorial(array[i]); // error fix in here,
    }

    return result;
}