diff --git a/lib/ControlledVocab/ControlledVocab.js b/lib/ControlledVocab/ControlledVocab.js
index 9aa65a413..b1331c85e 100644
--- a/lib/ControlledVocab/ControlledVocab.js
+++ b/lib/ControlledVocab/ControlledVocab.js
@@ -478,6 +478,8 @@ class ControlledVocab extends React.Component {
       user = <Link to={`/users/view/${metadata.updatedByUserId}`}>{name}</Link>;
     } else if (metadata.updatedByUserId === SYSTEM_USER_ID || !metadata.updatedByUserId) {
       user = <FormattedMessage id="stripes-smart-components.system" />;
+    } else {
+      user = <FormattedMessage id="stripes-components.metaSection.unknownUser" />;
     }
 
     return (
diff --git a/lib/ControlledVocab/tests/ControlledVocab-test.js b/lib/ControlledVocab/tests/ControlledVocab-test.js
index ddb7cae11..19c4ea888 100644
--- a/lib/ControlledVocab/tests/ControlledVocab-test.js
+++ b/lib/ControlledVocab/tests/ControlledVocab-test.js
@@ -270,8 +270,8 @@ describe('ControlledVocab', () => {
 
     it('should have row count 7', () => cv.has({ rowCount: 7 }));
 
-    it('should render the row with last updated by user-1 without user firstname or lastname', async () => {
-      await mcl.find(MultiColumnListCell({ row: 4, columnIndex: 3, content: '4/18/2019 by ' })).exists();
+    it('should render the row with last updated by unknown user without user firstname or lastname', async () => {
+      await mcl.find(MultiColumnListCell({ row: 5, columnIndex: 3, content: '4/18/2019 by Unknown user' })).exists();
     });
 
     it('should render the row with last updated by system with "System" text', async () => {
diff --git a/package.json b/package.json
index 1431b018d..49f06d4a4 100644
--- a/package.json
+++ b/package.json
@@ -14,6 +14,7 @@
     "node": ">=14.0.0"
   },
   "stripes": {
+    "actsAs": [],
     "okapiInterfaces": {
       "notes": "2.0 3.0",
       "tags": "1.0",