Memory errors in CS50 speller (pset5)

Question

I have successfully written a code that can spell check from loading a dictionary. To free the memory, I have written the unload() function and valgrind shows no memory leaks. But after submission, I am getting some cryptic errors, ie

Conditional jump or move depends on uninitialised value(s): (file: dictionary.c, line: 137)
Conditional jump or move depends on uninitialised value(s): (file: dictionary.c, line: 143)

Below are my unload() function, valgrind screenshot and submit50 result respectively. Please help.

Thanks.

//unload function

bool unload(void)
{
    for (int i = 0; i < N; i++)
    {
        node* temp = table[i];
        node* cursor = temp;
        while (temp != NULL)
        {
            cursor = temp->next;
            free(temp);
            temp = cursor;
        }
        free(cursor);

    }
    return true;
}

// valgrind result

// submit50 result

Answer 1

It's because temp -> next is uninitialized for some cases.

You could make it the last node in each table bucket point to NULL.