Error code for blockdiag with class definition

Blockdiag Error Code(class)

blockdiag {
  default_fontsize = 18;
	orientation = portrait;
	class page [shape = "roundedbox",textcolor = #ffffff,color = #1f497d];
	class popup [shape = "roundedbox",textcolor = #ffffff,color = #4bacc7];
	class condition[shape = "diamond",textcolor = #000000];

	// node description
	a [class = "page", label = "TOP\nhogehoge"];
	d [class = "popup"];

	a -> b -> c;
	a -> d;
}

// 実行結果
$ blockdiag test.diag --debug                                                                                                                            
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/blockdiag-1.2.4-py2.7.egg/blockdiag/utils/bootstrap.py", line 34, in run
    parsed = self.parse_diagram()
  File "/Library/Python/2.7/site-packages/blockdiag-1.2.4-py2.7.egg/blockdiag/utils/bootstrap.py", line 82, in parse_diagram
    return self.module.parser.parse_string(self.code)
  File "/Library/Python/2.7/site-packages/blockdiag-1.2.4-py2.7.egg/blockdiag/parser.py", line 216, in parse_string
    raise ParseException(str(e))
ParseException: got unexpected token: 5,13-5,14: Op '['

カラーコードをダブルクオートで囲むことで解決