While there are ways to work around this limitation, the best solution is to include a switch in the merge field.
Ọ bụ ezie na e nwere ụzọ isi rụọ ọrụ na njedebe a, ngwọta kachasị mma bụ ịgụnye mgba ọkụ n'ọhịa jikọtara.