When you are using the where In SQL-like search and provide an empty array for the in side of things ... DQL will barf and die with a syntax error. The fix is to check the count of items in the parameter being passed in and create a single entry with a non-possible value to filter down. /** * Creates an IN() expression with the given arguments. …

Expr.php

/**
     * Creates an IN() expression with the given arguments.
     *
     * @param string $x Field in string format to be restricted by IN() function.
     * @param mixed  $y Argument to be used in IN() function.
     *
     * @return Expr\Func
     */
    public function in($x, $y)
    {
        if (is_array($y)) {
            foreach ($y as &$literal) {
                if ( ! ($literal instanceof Expr\Literal)) {
                    $literal = $this->_quoteLiteral($literal);
                }
            }
        }

        return new Expr\Func($x . ' IN', (array) $y);
    }