PHP Error ▶ Unserialize

[MarcellusMusic]

I'm upgrading to Lifepress 0.3 & I've encounter the following PHP error:

A PHP ERROR WAS ENCOUNTERED

Severity: Notice

Message: unserialize() [function.unserialize]: Error at offset 19 of 101 bytes

Filename: models/item_model.php

Line Number: 77

Backtrace:

File: /home/content/88/4739388/html/LifePress-master/application/models/item_model.php
Line: 77
Function: unserialize

File: /home/content/88/4739388/html/LifePress-master/application/models/item_model.php
Line: 167
Function: _process

File: /home/content/88/4739388/html/LifePress-master/application/libraries/lifepress.php
Line: 348
Function: get_all_items

File: /home/content/88/4739388/html/LifePress-master/application/controllers/home.php
Line: 52
Function: get_items_page

File: /home/content/88/4739388/html/LifePress-master/index.php
Line: 251
Function: require_once

I have also noticed the same error on @MitchellMcKenna 's life press homepage ▶ http://mitchmckenna.com/

What is the cause & fix for this please?