Motorola sends out security patch to fix Moto G5 Plus "911" bug affecting Verizon VoLTE users1
Motorola suggests that once Moto G5 Plus users receive the patch, they install it immediately. After all, if you own the handset, the inability to connect to a 911 emergency operator at certain times could be the difference between life and death. And that is no joke. Once the update arrives, you should make sure that you are connected to a Wi-Fi network before beginning the updating process. And you need to have the phone's battery fully charged before installing the patch.
If you realize the potential for danger with this bug, and you want to protect you and your family right away without waiting for the update to hit your phone, you can try to manually receive it by going to Settings > About phone > System updates.