_swish_do_update() throws mysql duplicate entry error

in swish.integration.inc line 135,

replace below

....
      if(db_result(db_query("SELECT nid FROM {swish_fulltext} WHERE filepath = '%s' AND nid = %d", $file['filepath'], $file['nid']))) {
        db_query("UPDATE {swish_fulltext} SET `fulltext` = '%s' WHERE `filepath` = '%s'",$text, $file['filepath']);
      } else {
        db_query("INSERT INTO {swish_fulltext} (filepath,nid,`fulltext`) VALUES ('%s',%d,'%s')",$file['filepath'],$file['nid'],$text);
      }
...

by

...
      if(db_result(db_query("SELECT COUNT(nid) FROM {swish_fulltext} WHERE filepath = '%s' AND nid = %d", $file['filepath'], $file['nid']))) {
        db_query("UPDATE {swish_fulltext} SET `fulltext` = '%s' WHERE `filepath` = '%s'",$text, $file['filepath']);
      } else {
        db_query("INSERT INTO {swish_fulltext} (filepath,nid,`fulltext`) VALUES ('%s',%d,'%s')",$file['filepath'],$file['nid'],$text);
      }
...

otherwise it doesn't return number of rows.