diff --git a/baked_in.go b/baked_in.go
index e8d17a7..dd4b331 100644
--- a/baked_in.go
+++ b/baked_in.go
@@ -312,10 +312,15 @@ func isUnique(fl FieldLevel) bool {
 		}
 
 		m := reflect.MakeMap(reflect.MapOf(sfTyp, v.Type()))
+		var fieldlen int
 		for i := 0; i < field.Len(); i++ {
-			m.SetMapIndex(reflect.Indirect(reflect.Indirect(field.Index(i)).FieldByName(param)), v)
+			key := reflect.Indirect(reflect.Indirect(field.Index(i)).FieldByName(param))
+			if key.IsValid() {
+				fieldlen++
+				m.SetMapIndex(key, v)
+			}
 		}
-		return field.Len() == m.Len()
+		return fieldlen == m.Len()
 	case reflect.Map:
 		var m reflect.Value
 		if field.Type().Elem().Kind() == reflect.Ptr {
diff --git a/validator_test.go b/validator_test.go
index b8ebe64..07bc889 100644
--- a/validator_test.go
+++ b/validator_test.go
@@ -10043,6 +10043,7 @@ func TestUniqueValidationStructPtrSlice(t *testing.T) {
 	}{
 		{A: stringPtr("one"), B: stringPtr("two")},
 		{A: stringPtr("one"), B: stringPtr("three")},
+		{},
 	}
 
 	tests := []struct {