Fatal error: Cannot use object of type stdClass as array

Hello.

I'm having problems with the module OT Testimonial.
After installing it, and add a couple of items to be displayed, then press save, the module is "wrong" showing at the end in the direction the following error:

In the web, we can perfectly read the module and display the elements.
But I can not edit or delete them, and after create a module, need to write them all at once.

Thanks for the help.

I have managed to solve the problem.
You need to upgrade to the latest version of Joomla. The failure occurs when you use the version 3.2.2 and after upgrading to 3.3.6 everything works fine.
Thank you very much.

You're great!