diff --git a/superset-frontend/src/components/AlteredSliceTag/utils/index.ts b/superset-frontend/src/components/AlteredSliceTag/utils/index.ts
index 482a4332621..9fa9830e785 100644
--- a/superset-frontend/src/components/AlteredSliceTag/utils/index.ts
+++ b/superset-frontend/src/components/AlteredSliceTag/utils/index.ts
@@ -52,7 +52,7 @@ export const formatValueHandler = (
           v.comparator && v.comparator.constructor === Array
             ? `[${v.comparator.join(', ')}]`
             : v.comparator;
-        return `${v.subject} ${v.operator} ${filterVal}`;
+        return filterVal ? `${v.subject} ${v.operator} ${filterVal}` : `${v.subject} ${v.operator}`;
       })
       .join(', ');
   }
diff --git a/superset-frontend/src/components/AlteredSliceTag/utils/utils.test.ts b/superset-frontend/src/components/AlteredSliceTag/utils/utils.test.ts
index feddddeb0a1..1ceee92c589 100644
--- a/superset-frontend/src/components/AlteredSliceTag/utils/utils.test.ts
+++ b/superset-frontend/src/components/AlteredSliceTag/utils/utils.test.ts
@@ -258,6 +258,33 @@ describe('formatValueHandler', () => {
 
     expect(result).toEqual(expected);
   });
+
+  test('formats unary filter', () => {
+    const filters = [
+      {
+        expressionType: 'SIMPLE',
+        operator: 'IS NULL',
+        subject: 'a',
+      },
+      {
+        clause: 'WHERE',
+        comparator: ['hu', 'ho', 'ha'],
+        expressionType: 'SIMPLE',
+        operator: 'NOT IN',
+        subject: 'b',
+      },
+    ];
+    const key = 'adhoc_filters';
+
+    const expected = 'a IS NULL, b NOT IN [hu, ho, ha]';
+    const formattedValue: string | number = formatValueHandler(
+      filters,
+      key,
+      controlsMap,
+    );
+
+    expect(formattedValue).toEqual(expected);
+  });
 });
 
 // eslint-disable-next-line no-restricted-globals -- TODO: Migrate from describe blocks