diff --git a/backend/src/api/browser/index.js b/backend/src/api/browser/index.js
index 6695aa6..3133b01 100644
--- a/backend/src/api/browser/index.js
+++ b/backend/src/api/browser/index.js
@@ -24,7 +24,17 @@ const browserValidation = {
   bucket: param('bucket')
     .trim()
     .notEmpty()
-    .matches(/^[a-z0-9][a-z0-9.-]*[a-z0-9]$/),
+    .custom((value) => {
+      // Reject "undefined" and "null" strings (common frontend bugs)
+      if (value === 'undefined' || value === 'null') {
+        throw new Error('Invalid bucket name');
+      }
+      // Validate bucket name format
+      if (!/^[a-z0-9][a-z0-9.-]*[a-z0-9]$/.test(value)) {
+        throw new Error('Invalid bucket name format');
+      }
+      return true;
+    }),
 
   prefix: query('prefix')
     .optional()
diff --git a/backend/src/app.js b/backend/src/app.js
index d5f0539..58cfb4d 100644
--- a/backend/src/app.js
+++ b/backend/src/app.js
@@ -159,14 +159,50 @@ app.use((req, res) => {
 // Error handling middleware (must be last)
 app.use(errorHandler);
 
+// Initialize default MinIO alias from environment variables
+async function initializeDefaultAlias() {
+  const { defaultAlias, endpoint, accessKey, secretKey } = config.minio;
+
+  if (!endpoint || !accessKey || !secretKey) {
+    logger.info('Default MinIO connection not configured (MINIO_ENDPOINT, MINIO_ACCESS_KEY, MINIO_SECRET_KEY)');
+    return;
+  }
+
+  const MinIOService = require('./services/minio.service');
+  const minioService = new MinIOService();
+
+  try {
+    // Check if alias already exists
+    const aliases = await minioService.listAliases();
+    const existingAlias = aliases.find(a => a.alias === defaultAlias);
+
+    if (existingAlias) {
+      logger.info(`Default alias "${defaultAlias}" already configured`);
+      // Test connection
+      const testResult = await minioService.testConnection(defaultAlias);
+      logger.info(`Default alias "${defaultAlias}" connection status: ${testResult.status}`);
+    } else {
+      // Create the alias
+      logger.info(`Creating default alias "${defaultAlias}" -> ${endpoint}`);
+      await minioService.addAlias(defaultAlias, endpoint, accessKey, secretKey);
+      logger.info(`Default alias "${defaultAlias}" created and connected successfully`);
+    }
+  } catch (error) {
+    logger.error(`Failed to initialize default alias: ${error.message}`);
+  }
+}
+
 // Start server
 if (require.main === module) {
   const PORT = config.app.port;
-  
-  app.listen(PORT, () => {
+
+  app.listen(PORT, async () => {
     logger.info(`MinIO WebUI Backend running on port ${PORT}`);
     logger.info(`Environment: ${config.app.env}`);
     logger.info(`IP Restriction: ${config.security.enableIpRestriction ? 'Enabled' : 'Disabled'}`);
+
+    // Initialize default alias after server starts
+    await initializeDefaultAlias();
   });
 }
 
diff --git a/frontend/src/components/Policies/Policies.tsx b/frontend/src/components/Policies/Policies.tsx
index 249deb8..c62450f 100644
--- a/frontend/src/components/Policies/Policies.tsx
+++ b/frontend/src/components/Policies/Policies.tsx
@@ -123,7 +123,7 @@ const Policies: React.FC = () => {
   };
 
   const filteredPolicies = policies.filter((policy) =>
-    policy.name.toLowerCase().includes(searchTerm.toLowerCase())
+    policy?.name?.toLowerCase().includes(searchTerm.toLowerCase())
   );
 
   const isBuiltInPolicy = (policyName: string) => {
diff --git a/frontend/src/components/Users/Users.tsx b/frontend/src/components/Users/Users.tsx
index 3ab16d9..68c9948 100644
--- a/frontend/src/components/Users/Users.tsx
+++ b/frontend/src/components/Users/Users.tsx
@@ -96,7 +96,7 @@ const Users: React.FC = () => {
   };
 
   const filteredUsers = users.filter((user) =>
-    user.accessKey.toLowerCase().includes(searchTerm.toLowerCase())
+    user?.accessKey?.toLowerCase().includes(searchTerm.toLowerCase())
   );
 
   if (loading) {