Could you try setting up email for your crashes?
Open Terminal and input the following commands.
Set the e-mail address to send logs to: defaults write com.operasoftware.Opera OPCrashEmail firstname.lastname@example.org
To check if it was successfully set: defaults read com.operasoftware.Opera
email@example.com doesn't have to be your real email, just something by what we could easily identify crash in our crash logging system/ Currently I don't recall any similar reports and haven't seen it myself so no idea yet on how to help you with this.