Illegal offset type in unset (Session.php - Line 727)

Got a lot of warnings in my log with:

PHP Code:

Severity: Warning --> Illegal offset type in unset C:\var\data\localweb\gv\system\libraries\Session\Session.php 727 


What is it?

What do you try to unset from session ?
The Key must be string or array of strings. Its most likely that you have send either NULL or other type which can't be unset ..

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What do you try to unset from session ?
The Key must be string or array of strings. Its most likely that you have send either NULL or other type which can't be unset ..

That's right.
Doing a $this->session->unset_userdata($data); where $data array contains keys that doesn't exist, throw this warning.

Thanks a lot!