After the initial launch and some operation on the application, a save file has been created in the data folder in the working directory,
When you modify the JSON file to have "null" value in list, as shown below

It will causes the application crash when attempt to launch again.

After the initial launch and some operation on the application, a save file has been created in the data folder in the working directory,
When you modify the JSON file to have "null" value in list, as shown below
It will causes the application crash when attempt to launch again.