Maximum call stack size exceeded in development enviroment

I had the same problem not long ago, it was because of the structure of my page.

How is it built, in terms of its includes? Do you use section inclusion as follows: 

PHP Code:

<? = $ this-> extend ('default')?>

<? = $ this-> section ('content')?>
    <h1> Hello World! </h1>
<? = $ this-> endSection ()?>

(but it may not be that at all)