My friend is afraid of "losing control" and having a seizure during deep meditation. Is this fear rational?

My friend has severe anxiety and is convinced that if they let go and go too deep in meditation, they will lose control of their body and have a seizure. This fear prevents them from fully engaging. Is there any documented physical risk of meditation causing seizures in individuals who don't have epilepsy, or is this simply a manifestation of their general anxiety being projected onto the practice? His name is Vikram, born 22th March 1991 at 7:30 AM, in Jaipur.