Thread: Inserting into a BST - ADT

I am trying to build a BST ADT style containing data pointers to a WORD struct that I'm using for this application.
I've been going at this for a bit and I have yet to understand what I am doing wrong..
The fields of the struct are being handled correctly before insertion, but whenever I call the insert function it fails to execute properly and my program crashes.
Here is what I've written for this:

Code:

/*
list is a pointer to the header of the BST, string is a dynamically 
allocated string (the word field), and length is the strlen of the 
string
*/
void addWord (BST_TREE *list, char *string, int length)
{
    WORD *wordPtr;
    wordPtr = (WORD*)BST_Retrieve(list, (void*)string);
    //If the key (string) is found in the BST, BST_Retrieve returns a pointer to the data in the 
    //node containing the key, otherwise it returns NULL
    if(!wordPtr)//if the key is not found
    {
        wordPtr = createWord();//allocate memory for new WORD pointer
        wordPtr->word = (char*) calloc(length + 1, sizeof(char));
        strncpy(wordPtr->word, string, length);
        if(BST_Insert(list, (void*)wordPtr))//Insert to BST
            printf("%s was inserted succesfully (%d)\n", wordPtr->word, wordPtr->count);
        else
            printf("Error! Did not insert\n");
    }
    else{//if key is found
        wordPtr->count++;//add to count, # of times key appears in the input (text file)
        printf("%s was found in the list (%d)\n", wordPtr->word, wordPtr->count);
    }
    return;
}

I am calling this in a loop from another function. Everything functions properly until I call the BST ADT functions, BST_Retrieve, BST_Insert:

Code:

while(fgets(buf, sizeof(buf), fp1)){//Read full line into buffer string
        length = strlen(buf);
        if(length > 1){//Check for lines with text
            pFirst = &buf[0];
            for(pLast = buf + 1; pLast < buf + length; pLast++)
            {
                if(*pLast == ' ' || *pLast == '\n'){//Check for spaces or newline
                    temp_length = strlen(pFirst) - strlen(pLast);
                    if(temp_length > 0)
                    {
                        temp = formatString(pFirst, &temp_length);
                        printf("%s(%d)\n", temp, strlen(temp));
                        addWord(wordBST, temp, temp_length);//Insert to BST
                        free(temp);
                        pFirst = pLast + 1;//Reset initial pointer position
                    }
                    else
                        pFirst = pLast + 1;//Condition for empty strings
                }
            }
        }
    }

Can anyone please help me figure out why this isn't working?
Any and all feedback is appreciated