Restoration prompt on opening a particular chat.

So I accidentally deleted this chat with my friend once and now every time I receive a message from him and try opening i get the message ' what's app has stopped working' and brings me back to home. When I reopen the app it asks me to restore all my messages which it does, all but that particular chat. And this just happens whenever either I try to send him a message or receive it. All my backups are regular.
Please help, it's annoying the crap out of me

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