fix: test error

Author: valley

packages/react-router-dev/config/config.ts

@@ -407,8 +407,8 @@ async function resolveConfig({
 
         let configPreset = reactRouterConfig;
 
-        if ("presets" in reactRouterConfig) {
-          configPreset = omit(reactRouterConfig, excludedConfigPresetKeys);
+        if (configPreset != null && "presets" in configPreset) {
+          configPreset = omit(configPreset, excludedConfigPresetKeys);
         }
 
         return configPreset;