Resetting the value of $this

[eluser]nydeveloper[/eluser]
For some reason this causes the code to stop running. No errors, no warnings, etc. However, the code stops running completely once it hits this line. Nothing below it is executed.

The same goes for the following lines that I've tried:

Code:

$this->db->_reset_write();
$this->db->free_result();
$this->db->_reset_select();