Or, a more simple way.
After crash, after you've started Opera and encountered an empty new session, while Opera is open, do a back-up of this folder -> %AppData%\Opera Software\Opera Stable\Sessions
Then you can close Opera, rename/delete current "Sessions" folder, and replace it the one from backup. Keep the backup until you will have a recovered session. Make sure in current "Sessions" folder is only by one "Session_####" and "Tabs_####" file (the smallest one can be deleted).
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