diff --git a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java
index 0a92124c3..408148a0d 100644
--- a/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java
+++ b/springdoc-openapi-webmvc-core/src/main/java/org/springdoc/webmvc/api/OpenApiResource.java
@@ -168,7 +168,8 @@ && isPathToMatch(operationPath)) {
 				}
 			}
 		}
-		routerFunctionProvider.flatMap(RouterFunctionProvider::getWebMvcRouterFunctionPaths).ifPresent(routerBeans -> routerBeans.forEach(this::getRouterFunctionPaths));
+		routerFunctionProvider.ifPresent(routerFunctions -> routerFunctions.getWebMvcRouterFunctionPaths()
+				.ifPresent(routerBeans -> routerBeans.forEach(this::getRouterFunctionPaths)));
 	}