Actor Dick Van Dyke was once known for playing clumsy characters with poor accents, and now the 87-year-old actor may now be facing a challenge greater than chimney sweeping.

Entertainment Tonight is reporting that Van Dyke has cancelled an appearance in New York due to a “yet-to-be diagnosed neurological disorder.” The publication cites a “rep” of Van Dyke’s as stating the actor’s symptoms have prevented him from attending an April 26 award ceremony in New York, and that he has cancelled appearances that call for air travel on the advice of doctors.

Van Dyke was due to receive a Lifetime Achievement Award from the 92nd Street Y. The actor was awarded a separate Lifetime Achievement Award from the Screen Actors Guild in January.

Van Dyke is famous for roles in classic films such as Bye Bye Birdie, Mary Poppins, and Chitty Chitty Bang Bang. He was also the star of The DIck Van Dyke Show during the 60s and Diagnosis: Murder during the 90s. Most recently, Van Dyke has appeared in two Night at the Museum movies.

Just over one year ago, Van Dyke married his 40-year-old girlfriend, Arlene Silver.