diff --git a/pgrx-macros/src/lib.rs b/pgrx-macros/src/lib.rs
index 37c70bdfcc..b070451806 100644
--- a/pgrx-macros/src/lib.rs
+++ b/pgrx-macros/src/lib.rs
@@ -967,7 +967,7 @@ fn impl_postgres_type(ast: DeriveInput) -> syn::Result<proc_macro2::TokenStream>
             #[::pgrx::pgrx_macros::pg_extern(immutable,parallel_safe)]
             pub fn #funcname_in #generics(input: Option<&::core::ffi::CStr>) -> Option<#name #generics> {
                 input.map_or_else(|| {
-                    for m in <#name as ::pgrx::inoutfuncs::InOutFuncs>::NULL_ERROR_MESSAGE {
+                    if let Some(m) = <#name as ::pgrx::inoutfuncs::InOutFuncs>::NULL_ERROR_MESSAGE {
                         ::pgrx::pg_sys::error!("{m}");
                     }
                     None
@@ -990,7 +990,7 @@ fn impl_postgres_type(ast: DeriveInput) -> syn::Result<proc_macro2::TokenStream>
             #[::pgrx::pgrx_macros::pg_extern(immutable,parallel_safe)]
             pub fn #funcname_in #generics(input: Option<&::core::ffi::CStr>) -> Option<::pgrx::datum::PgVarlena<#name #generics>> {
                 input.map_or_else(|| {
-                    for m in <#name as ::pgrx::inoutfuncs::PgVarlenaInOutFuncs>::NULL_ERROR_MESSAGE {
+                    if let Some(m) = <#name as ::pgrx::inoutfuncs::PgVarlenaInOutFuncs>::NULL_ERROR_MESSAGE {
                         ::pgrx::pg_sys::error!("{m}");
                     }
                     None