diff --git a/src/services/navigationBar.ts b/src/services/navigationBar.ts
index bfbaf5a6287ce..022c538e76278 100644
--- a/src/services/navigationBar.ts
+++ b/src/services/navigationBar.ts
@@ -412,8 +412,7 @@ namespace ts.NavigationBar {
             case SyntaxKind.JSDocTypedefTag:
                 return getJSDocTypedefTagName(<JSDocTypedefTag>node);
             default:
-                Debug.fail();
-                return "";
+                return "<unknown>";
         }
     }
 
diff --git a/tests/cases/fourslash/navigationBarNamespaceImportWithNoName.ts b/tests/cases/fourslash/navigationBarNamespaceImportWithNoName.ts
new file mode 100644
index 0000000000000..732e2deb1dd40
--- /dev/null
+++ b/tests/cases/fourslash/navigationBarNamespaceImportWithNoName.ts
@@ -0,0 +1,13 @@
+////import *{} from 'foo';
+verify.navigationBar([
+    {
+        "text": "\"navigationBarNamespaceImportWithNoName\"",
+        "kind": "module",
+        "childItems": [
+            {
+                "text": "<unknown>",
+                "kind": "alias"
+            }
+        ]
+    }
+]);