HELP ME with Storing Data from a Timer in TinyDB

Hello, everyone! Hope you are doing well and staying safe! I am working on a timer in MIT App Inventor and I want to store the minutes that the user has used the timer before and add it to the minutes the user used it today in TinyDB, but I am unable to so far. Could you please try to help me? I need this ASAP! Thank you in advance! I have some images and the .aia file included below.

MIT_AppInvetorHelp2.aia (5.1 KB)

Try this:

storeMinutes.aia (4.0 KB)