Why does Libre Office Base keep crashing ?

Hi, i am new to the forum, so please bear with me. I am trying to make a database in Libre Office Base. The point is that i can add or change data in the query, that is made of 4 tables, and the tables update. I figured out how to do that, but when i add data trough a form, the LibreOffice crashes every time. I also have a problem with data that i pick form combo boxes. I wish to use this data in a single page report, but i don’t know how to use only data entered in a form.

If anyone has any advice please help.

Link to the database file - https://drive.google.com/open?id=0B6MtDLDcqWhDalFCWkt0UGkxczg

I have similar problems with Libre Office base repeatedly crashing … :frowning: