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If you have received a binary code and your app is crashing: WhatsApp Web:

When WhatsApp tries to render these complex or excessive characters, it can exhaust the device's memory or cause an "index out of bounds" exception in the app's code, leading to an immediate crash.

If the crash loop persists, you may need to uninstall and reinstall the app, ensuring you have a recent backup to restore your conversations.

Receiving these messages can cause the app to close repeatedly, slow down the phone, or make the specific chat thread impossible to open. The 2021 Patched Status

WhatsApp’s automated systems can flag accounts that send repetitive, non-standard character strings as "spam" or "malicious," leading to a permanent ban.