freightquote module

[jimmie]

i need help with this error

PHP Fatal error: Uncaught TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in

and here is line from file

/* Formats the database columns to be used in SQL queries */
function getDatabaseColumns() {
$fqString = implode(',', $this->fqDatabaseColumns);

return $fqString;
}