chore: update

Author: meabed

src/fieldsConverter.ts

@@ -395,7 +395,7 @@ export function enumToGraphQL(
         } else if (value === '') {
           key = 'EMPTY_STRING';
         } else {
-          key = value.replace(/[^_a-zA-Z0-9]/g, '_').replace(/(^[0-9])(.*)/g, 'a_$1$2');
+          key = value?.replace(/[^_a-zA-Z0-9]/g, '_')?.replace(/(^[0-9])(.*)/g, 'a_$1$2');
         }
         result[key] = { value };
         return result;