diff --git a/apps/web/src/components/nosql-explorer/connection-service.ts b/apps/web/src/components/nosql-explorer/connection-service.ts
index 8a49d01b..5b2f15ca 100644
--- a/apps/web/src/components/nosql-explorer/connection-service.ts
+++ b/apps/web/src/components/nosql-explorer/connection-service.ts
@@ -89,7 +89,13 @@ export const getConnections = async (
     _userId: string,
     encryptionKey: CryptoKey
 ): Promise<SavedConnection[]> => {
-    const raw = (await proxyRequest<ConnectionRaw[]>("GET", "/api/v1/nosql/connections")) ?? [];
+    const rawAll = (await proxyRequest<ConnectionRaw[]>("GET", "/api/v1/nosql/connections")) ?? [];
+    // Drop malformed rows — any item missing `id`/`encryptedData`/`iv` would crash
+    // downstream renders that key off `conn.id`.
+    const raw = rawAll.filter(
+        (c): c is ConnectionRaw =>
+            !!c && typeof c === "object" && typeof c.id === "string" && !!c.encryptedData && !!c.iv
+    );
 
     const results = await Promise.allSettled(
         raw.map(async (conn): Promise<SavedConnection> => {
diff --git a/apps/web/src/components/nosql-explorer/explorer-sidebar.tsx b/apps/web/src/components/nosql-explorer/explorer-sidebar.tsx
index 0d622965..12e65ef8 100644
--- a/apps/web/src/components/nosql-explorer/explorer-sidebar.tsx
+++ b/apps/web/src/components/nosql-explorer/explorer-sidebar.tsx
@@ -363,6 +363,9 @@ export function ExplorerSidebar({
     const matchesSearch = (text: string) => text.toLowerCase().includes(searchQuery.toLowerCase());
 
     const filteredConnections = connections.filter(node => {
+        // Drop malformed nodes — any entry missing `connection.id` would crash
+        // the renderer (which reads `node.connection.id` as the React key).
+        if (!node?.connection || typeof node.connection.id !== "string") return false;
         if (!searchQuery) return true;
         if (matchesSearch(node.connection.name)) return true;
 
diff --git a/apps/web/src/components/nosql-explorer/tab-bar.tsx b/apps/web/src/components/nosql-explorer/tab-bar.tsx
index 26939dee..90cb3873 100644
--- a/apps/web/src/components/nosql-explorer/tab-bar.tsx
+++ b/apps/web/src/components/nosql-explorer/tab-bar.tsx
@@ -33,11 +33,15 @@ export function TabBar({ tabs, activeTabId, onTabChange, onTabClose, onCloseAll
         return <div className="border-b h-[37px] bg-muted/10" />;
     }
 
+    // Defensive: filter out malformed entries — a single undefined/missing-id tab
+    // would crash the whole component (`tab.id` read on undefined inside .map).
+    const safeTabs = tabs.filter((t): t is ExplorerTab => !!t && typeof t.id === "string");
+
     return (
         <div className="flex items-center border-b bg-muted/10">
             <ScrollArea className="flex-1 w-full whitespace-nowrap">
                 <div className="flex items-center px-1">
-                    {tabs.map((tab) => {
+                    {safeTabs.map((tab) => {
                         const isActive = activeTabId === tab.id;
                         const isFiltered = hasActiveQuery(tab);
                         return (