Iphone 7 WhatsApp Problems

G'day, i have one problem with my phone. I don't know how to fix it :(

Basically someone sent me crash codes from WhatsApp, i can't see them in my notifications or in WhatsApp, but WhatsApp is not oppening or oppening for a little amount of time then crashes again.

I know that is crash codes (messages with big amount of symbols), because everytime my WhatsApp crashes is because of the crash codes.

Before i was fixing it by android phone. Basically i was sign in to my WhatsApp by another android phone, then i was blocking all the people who sent me codes + also delete all them codes as-well.

But now i don't have second phone, so how can i repair my WhatsApp? Should i wait?

Thanks for your attention and i hope you can help me :)