diff --git a/docs/content/doc/usage/errors.md b/docs/content/doc/usage/errors.md
index f5325ddd..521d93ee 100644
--- a/docs/content/doc/usage/errors.md
+++ b/docs/content/doc/usage/errors.md
@@ -4,8 +4,8 @@ title: "Errors"
 draft: false
 type: "doc"
 menu:
-  sidebar:
-    parent: "usage"
+sidebar:
+parent: "usage"
 ---
 
 # Errors
@@ -52,14 +52,15 @@ This document describes the different errors Vikunja can return.
 
 ## List
 
-| ErrorCode | HTTP Status Code | Description |
-|-----------|------------------|-------------|
-| 3001 | 404 | The list does not exist. |
-| 3004 | 403 | The user needs to have read permissions on that list to perform that action. |
-| 3005 | 400 | The list title cannot be empty. |
-| 3006 | 404 | The list share does not exist. |
-| 3007 | 400 | A list with this identifier already exists. |
+| ErrorCode | HTTP Status Code | Description                                                                                                                   |
+|-----------|------------------|-------------------------------------------------------------------------------------------------------------------------------|
+| 3001 | 404 | The list does not exist.                                                                                                      |
+| 3004 | 403 | The user needs to have read permissions on that list to perform that action.                                                  |
+| 3005 | 400 | The list title cannot be empty.                                                                                               |
+| 3006 | 404 | The list share does not exist.                                                                                                |
+| 3007 | 400 | A list with this identifier already exists.                                                                                   |
 | 3008 | 412 | The list is archived and can therefore only be accessed read only. This is also true for all tasks associated with this list. |
+| 3009 | 412 | The list cannot belong to a dynamically generated namespace like "Favorites".                                                 |
 
 ## Task
 
diff --git a/pkg/models/error.go b/pkg/models/error.go
index 8f97d24c..eb96d542 100644
--- a/pkg/models/error.go
+++ b/pkg/models/error.go
@@ -237,7 +237,7 @@ type ErrListIsArchived struct {
 	ListID int64
 }
 
-// IsErrListIsArchived checks if an error is a .
+// IsErrListIsArchived checks if an error is a list is archived error.
 func IsErrListIsArchived(err error) bool {
 	_, ok := err.(ErrListIsArchived)
 	return ok
@@ -255,6 +255,34 @@ func (err ErrListIsArchived) HTTPError() web.HTTPError {
 	return web.HTTPError{HTTPCode: http.StatusPreconditionFailed, Code: ErrCodeListIsArchived, Message: "This list is archived. Editing or creating new tasks is not possible."}
 }
 
+// ErrListCannotBelongToAPseudoNamespace represents an error where a list cannot belong to a pseudo namespace
+type ErrListCannotBelongToAPseudoNamespace struct {
+	ListID      int64
+	NamespaceID int64
+}
+
+// IsErrListCannotBelongToAPseudoNamespace checks if an error is a list is archived error.
+func IsErrListCannotBelongToAPseudoNamespace(err error) bool {
+	_, ok := err.(*ErrListCannotBelongToAPseudoNamespace)
+	return ok
+}
+
+func (err *ErrListCannotBelongToAPseudoNamespace) Error() string {
+	return fmt.Sprintf("List cannot belong to a pseudo namespace [ListID: %d, NamespaceID: %d]", err.ListID, err.NamespaceID)
+}
+
+// ErrCodeListCannotBelongToAPseudoNamespace holds the unique world-error code of this error
+const ErrCodeListCannotBelongToAPseudoNamespace = 3009
+
+// HTTPError holds the http error description
+func (err *ErrListCannotBelongToAPseudoNamespace) HTTPError() web.HTTPError {
+	return web.HTTPError{
+		HTTPCode: http.StatusPreconditionFailed,
+		Code:     ErrCodeListCannotBelongToAPseudoNamespace,
+		Message:  "This list cannot belong a dynamically generated namespace.",
+	}
+}
+
 // ================
 // List task errors
 // ================
diff --git a/pkg/models/list.go b/pkg/models/list.go
index 8857050f..822943f8 100644
--- a/pkg/models/list.go
+++ b/pkg/models/list.go
@@ -543,6 +543,10 @@ func (l *List) CheckIsArchived(s *xorm.Session) (err error) {
 }
 
 func checkListBeforeUpdateOrDelete(s *xorm.Session, list *List) error {
+	if list.NamespaceID < 0 {
+		return &ErrListCannotBelongToAPseudoNamespace{ListID: list.ID, NamespaceID: list.NamespaceID}
+	}
+
 	// Check if the namespace exists
 	if list.NamespaceID > 0 {
 		_, err := GetNamespaceByID(s, list.NamespaceID)
diff --git a/pkg/models/list_test.go b/pkg/models/list_test.go
index 843aad96..4f02b78e 100644
--- a/pkg/models/list_test.go
+++ b/pkg/models/list_test.go
@@ -221,6 +221,25 @@ func TestList_CreateOrUpdate(t *testing.T) {
 				assert.False(t, can) // namespace is not writeable by us
 				_ = s.Close()
 			})
+			t.Run("pseudo namespace", func(t *testing.T) {
+				usr := &user.User{
+					ID:       6,
+					Username: "user6",
+					Email:    "user6@example.com",
+				}
+
+				db.LoadAndAssertFixtures(t)
+				s := db.NewSession()
+				list := List{
+					ID:          6,
+					Title:       "Test6",
+					Description: "Lorem Ipsum",
+					NamespaceID: -1,
+				}
+				err := list.Update(s, usr)
+				assert.Error(t, err)
+				assert.True(t, IsErrListCannotBelongToAPseudoNamespace(err))
+			})
 		})
 	})
 }