You are scraping, and ARRM crashes. Rest assured, what you've already scraped isn't lost. ARRM has a data recovery system when an application crash occurs.
To activate this feature, check the Temporary Gamelist checkbox in the Gamelist Options tab (see screen below)
After a crash, restart ARRM, and reload the system you were scraping at the time of the crash.
When loading a system, if ARRM detects that a crash has occurred, it offers to restore the information recovered up to the time of the crash.
This popup appears:
Click the OK button
ARRM will take care of merging the data scraped before the crash with your old gamelist.xml
Alternative method using ARRM cache:
You can also do a recovery with the cache system See: How to use the ARRM cache