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Opera crashes in whatsapp web in latest version. Please fix this asap.
Version: 39.0.2256.71 - Opera is up to date
You didn't read the 'posting guide'.
What OS? What are the steps to (try to) reproduce the problem? Have you checked with extensions disabled, in case you use any?
The problem is obvious, there was no problem before the latest update. So all other information is useless.
If you don't want to give (enough) information about your issue then you don't want any help regarding it.