Program crashing after using "Free()" command (C)

I have the following struct:

typedef struct employee{    int   name_length;    char* name;    float  salary;} Employee;

and the following functions:

Employee** makeArr(char* fileName, int* size){    FILE* f = fopen(fileName, "rb");    checkOpenFile(f);    Employee** arr = (Employee**)malloc(sizeof(Employee*));    checkAllocation(&arr);    int counter = 0;    while (!feof(f))    {        int employeeNameSize;        float employeeSalary;        fread(&employeeNameSize, sizeof(int), 1, f);        if (feof(f))            break;        char* employeeName = (char*)malloc(sizeof(char) * employeeNameSize+1);        checkAllocation(&employeeName);        fread(employeeName, sizeof(char), employeeNameSize, f);        employeeName[employeeNameSize] = '\0';        fread(&employeeSalary, sizeof(float), 1, f);        arr[counter] = makeEmployee(employeeNameSize, employeeName, employeeSalary);        counter++;        realloc(arr, sizeof(Employee*)*(counter));    }    *size = counter;    fclose(f);    return arr;} 

and:

void freeEmployeeArr(Employee** arr, int size){    for(int i = 0; i < size; i++)    {        free(arr[i]->name);        free(arr[i]);    }     free(arr); }

and this:

Employee* makeEmployee(int nameLength, char* name, float salary){    Employee* tmp = (Employee*)malloc(sizeof(Employee));    checkAllocation(&tmp);    tmp->name_length = nameLength;    tmp->name = name;    tmp->salary = salary;    return tmp;}

my main:

void main(int argc, char* argv[]){    char* name1 = argv[1];     char* name2 = argv[2];    int size;    Employee** ans = makeArr(name1, &size);    freeEmployeeArr(ans, size);}

The problem that I encounter:

free(arr);

crashes my program. If I remove this line, everything works fine.But this specific causes me some problems.If I'm trying to start without debugging, I get this message:

and if I'm debugging, I get this message:

I really have no idea what's wrong with my program. I've read that these kind of problems might appear when I realloc/malloc with a value of zero. But this is not the case.

Can anyone spot my mistake here?Thanks in advance.