Segmentation fault: zsh: segmentation fault - c

Question

I get a segfault when I add (int filter) in the struct. Is it possible to fix?
Error message: zsh: segmentation fault
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
typedef struct Student {
char name[30];
char surname[30];
int course; // year of study
double average; // average grade
int load; // number of courses
char courses[10][30]; // course names
int grades[10]; // course grades
char languages[100]; // spoken languages
int negative;
// int filter;
} Student;
int main(int argc, char *argv[]) {
FILE *db = NULL;
// open database file for reading, provide a parameter or use default "db.bin"
if (argc > 1)
db = fopen(argv[1], "rb");
else
db = fopen("db.bin", "rb");
if (db){
Student students[1000]; // all the data goes here
int size = 0; // how many students in database
// reading data from file
fread(&size, sizeof(int), 1, db);
for (int i = 0; i < size; i++){
fread(&students[i], sizeof(Student), 1, db);
}
printf("%d records loaded succesfully\n", size);
// MODIFY CODE BELOW
int counterDemo = 0; // for counting students
for (int i = 0; i < size; ++i){ // process all the student records in database
Student s = students[i]; // store data for each student in s
s.negative = 0;
// Checking if student has Philosophy and passed Philosophy exam
for(int j = 0; j < s.load; ++j)
{
if(!strcmp(s.courses[j], "Philosophy"))
{
s.negative++;
}
}
bool philosophy_exam = false;
if(s.negative != 0) // If student has Philosophy and passed Philosophy exam
{
philosophy_exam = true;
}
if(philosophy_exam){ // *** first filter, conditions on the student
int anotherDemo = 0; // for counting courses/grades
printf("%s %s %d %.2f %d ", s.name, s.surname, s.course, s.average, s.load); // print student data
for (int i = 0; i < s.load; ++i){ // process each course taken by the student
if(1){ // *** second filter, conditions on the course/grade
++anotherDemo; // counting courses
printf("%s %d ", s.courses[i], s.grades[i]);
}
}
printf("%s\n", s.languages);
if (anotherDemo == s.load) // *** third filter, various other conditions
++counterDemo; // counting studfents
}
}
printf("Filter applied, %d students found\n", counterDemo); // how many passed the filters
fclose(db);
} else {
printf("File db.bin not found, check current folder\n");
}
return 0;
}
I commented the problematic variable out.
Also I run my code on terminal, like always. I am using (clang "file" -o main) could this be the problem? I have tried to run this code in different apps, but it doesn't help.