Sorry about this! We’re still collecting information on these problems to find the cause.
Is this the log file from when the game crashed, or from when you loaded the game after? Unfortunately the log file from the crash is much more likely to have helpful information.
Depending on the nature of the crash, there may be files located here: C:/Users/YOURNAME/AppData/Local/Temp/Eleventh Hour Games/Last Epoch/Crashes. They are labelled by date/time, so if you find any that correspond please upload them.
Which tabs of these had items in them, and which tab were Arena Keys in? Were items deleted from the tab that has Arena Keys?