Invalid argument supplied for foreach() , when i use sessions

hi everyone,

i write data in a session, which works perfectly well. but when i try
to loop through it with foreach the error appears

"Invalid argument supplied for foreach()"

i figured that only arrays can be looped. here is what i did:

filling the session:

$input_title = $this->data['Linkable']['notes'];
$this->Session->write('Linkable.title', $input_title);

setting:
$this->set('linkables', $this->Session-
>read('Linkable.title'));

trying to echo data from my session in my view:

<?php
foreach ($linkables as $linkable):
endforeach;
?>

<span id="data"><?php echo $linkable['linkable.title']; ?></span>

what did i do wrong? i thought with $this->Session-
>write('Linkable.title', $input_title); i already created an array?

i appreciate your help. as always ;)

thx

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