Flex+Cygwin --> Error: Exception: STATUS_ACCESS_VIOLATION

 Hi people
  
  I'm trying to develop a scanner using flex+cygwin, it's just a silly  scanner what i want to do is to store every yytext in a char **tokens  vector. And after generate the lex.yy.c and compile it. The result of  the execution is an error:
  
  4 [main] test 3616 handle_exceptions: Exception: STATUS_ACCESS_VIOLATION
  924 [main] test 3616 open_stackdumpfile: Dumping stack trace to test.exe.sta
  ckdump
  
  
  Anybody can help me, please?
  
  This is the .y file:
  
  // Begin File //
  
  %{  
    #include <stdlib.h> /* need this for the call to malloc(), free() */ 
    #include <string.h> /* need this for the call to strcpy() */
  %}
  
  /* Global variables needed in the program */
      char **tokens = NULL;
      int tokensIndex = 0;
  %%
  
  . {
      if ((tokens[tokensIndex] = strdup(yytext)) != NULL) {
              tokensIndex++;
      } else {
          printf("ERROR: While duplicating memory from yytext.\n");
          exit(1);
      }
  }
  
  %%
  
  int main(int argc, char ** argv ) {
      ++argv, --argc;  /* skip over program name */
      if ( argc > 0 ) {
          yyin = fopen( argv[0], "r" );
      } else {
          exit(1);
      }
      
      /* Store the tokens in variable char **tokens */
      yylex();
      
      /* Print all the tokens propertly*/
      int i = 0;
      for(;i<tokensIndex;i++) {
          printf("%s\n",tokens[i]);
          free(tokens[i]);
      }
  }
  
  // End File //
  
  Thanks a lot, for your answers.
  
  
  

		
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