timereg weekview gives atk illegal string offset error (achievo-1.4.5)

[dalers]

I'm getting an ATK error testing an Achievo 1.4.6 alpha (working through the Guided Tour on the GitHub wiki), and see an error after clicking weekview in time registration.

Procedure: from menu, access Time registration / Time Registration and click 'weekview'.

Results:

error: [+0.25623s / 0.00035s] [Warning] Illegal string offset 'id' in /usr/local/www/achievo-1.4.5/atk/attributes/class.atknumberattribute.inc (line 362)[/code]

I'm testing with xampp on Win7 (php 5.4.4, mysql 5.5.25). My 1.4.5 production server (unmodified) has the same behavior (FreeBSD 8.3, php 5 4.6, mysql 5.5.16).

I don't imagine 1.4.5 was released with this behavior, so I wonder if it's related to the php or mysql version (or if in fact, has been there for a while). For what it's worth, I converted all the Achievo tables to MyISAM in both systems (local xampp, and FreeBSD production server), as mysql created them as InnoDB by default.

[gverduci]

Same problem.
I'm testing with VM bitnami Lampstack (php 5.4.9, mysql 5.5.28)