If you are running Agama wallet with any native coins, you should stop the wallets first before closing down Agama app. Otherwise, you risk chain database to get corrupted and next wallet daemon may throw error starting the coin.
Click on the 3 dots from the top left corner of the respective wallet and click on Stop button. Do the same for all current coins that are open. You may see Remove button, use that for any coins you started in Lite mode only.
You will get orange notification that the wallet is being shut down on the lower-right corner.
Wait until you see the last coin stops properly and brings you back to the main Agama screen. You will see a green notification that the wallet is now stopped. After seeing the message you can close down Agama safely.
Follow these steps every time when you finish using Agama. This will reduce corrupting the database and prevents errors.