diff --git a/apps/server/src/modules/h5p-editor/controller/dto/ajax/post.body.params.transform-pipe.ts b/apps/server/src/modules/h5p-editor/controller/dto/ajax/post.body.params.transform-pipe.ts
index 5189e5afbae..f9cf3770821 100644
--- a/apps/server/src/modules/h5p-editor/controller/dto/ajax/post.body.params.transform-pipe.ts
+++ b/apps/server/src/modules/h5p-editor/controller/dto/ajax/post.body.params.transform-pipe.ts
@@ -25,6 +25,8 @@ export class AjaxPostBodyParamsTransformPipe implements PipeTransform {
 				transformed = plainToClass(ContentBodyParams, value);
 			} else if ('libraryParameters' in value) {
 				transformed = plainToClass(LibraryParametersBodyParams, value);
+			} else {
+				return undefined;
 			}
 
 			const validationResult = await validate(transformed);