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?