splitting strings memory glibc kinda problem

[_sluimers_]

vector<char*> * Program::StringSplit(char * str, char * delim){
	vector<char*> * results = new vector<char*>;
	char * word;
	word = strtok (str,delim);
	results->push_back(word);

	while (word != NULL){
		word = strtok (NULL, delim);
		if(word != NULL){
			results->push_back(word);
		}
	}
	return results;
}

It works with a string of one word and sometimes two.
Using more words and one of the words are no longer accurate.

But when using 7 words this is the first line of the very long error I get:
*** glibc detected *** ./shell: free(): invalid next size (normal): 0x08264300 ***

I'm not that good at programmnig. All I know is that is has memory problems.
What is wrong with this code and how should it be fixed in order to correctly split
strings?