diff --git a/packages/logger/src/define-package.ts b/packages/logger/src/define-package.ts
index 9911358..60ae85a 100644
--- a/packages/logger/src/define-package.ts
+++ b/packages/logger/src/define-package.ts
@@ -7,6 +7,10 @@ Alwatr.packages ??= {};
 
 const logger = createLogger('logger');
 
+if ('registeredList' in Alwatr) {
+  logger.accident?.('define-package', 'duplicate_old_package_defined', Alwatr.registeredList);
+}
+
 export const definePackage = (packageName: string, version: string) => {
   logger.logMethodArgs?.('define-package', {packageName, version});