C :: Seg Fault Using Logical OR On For Loop

I've received a segmentation fault in this part of code:

Code:
for (; str[i] != '' || str[i] != ' '; i++) {
result[result_pos] = str[i];
result_pos++;
}

which, should mean:

Code: If str[i] is not equal to NULL character nor ' '; then, keep printing the chars within the word to variable result.

To understand what the function does, here's the whole code:

static char result[999];
/* char *split_word(const char *str, long n);
* Splits a string word-by-word. Where N is the word number. */
char *split_word(const char *str, long n) {

[Code]....

I'm trying to accomplish an easier way round to split string by word than using "strtok_r()". It might sound like "re-inventing the wheel", but... i will try to make it neat later.

The code looks okay, why would it segfault?