When associative array, $options[0] is undefined

When $options contains the 'task' key in its associative array form, an exception will be thrown when trying to access $options[0]:

ErrorException [ 8 ]: Undefined offset: 0 ~ DOCROOT/vendor/kohana/minion/classes/Kohana/Minion/Task.php [ 105 ]

To replicate this independently of Minion's implementation, try running this:

php -r "echo ['task'=>'foo']['task'];"   // Will correctly print out "task"

php -r "echo ['task'=>'foo'][0];"  // Will throw PHP Notice:  Undefined offset: 0 in Command line code on line 1