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Message: [QUOTE="rush2balaji, post: 3466990"] In this code: 1 for (tmp = 0; tmp < wordDBSize; tmp++) { 2 word = NULL; 3 word = popStack(wordDB); 4 if (fprintf(dst, "%d: %s\n", tmp + 1, word) < 0) 5 show_err("(antra)[main] Can not write to file. Please check <destination_file> permissions. Exiting."); 6 /* FIXME - PROBLEM HERE - (line below) */ 7 free(word); 8 } In line 3, you get "word" from popStack(). What if word was NULL? popStack() do return NULL on one case. You can't free NULL [/QUOTE]