diff --git a/models/error.go b/models/error.go
index bbf8a94fc..de48c22e1 100644
--- a/models/error.go
+++ b/models/error.go
@@ -399,6 +399,22 @@ func (err ErrNeedToHaveNamespaceReadAccess) Error() string {
 	return fmt.Sprintf("You need to be namespace owner to do that [NamespaceID: %d, UserID: %d]", err.NamespaceID, err.UserID)
 }
 
+// ErrTeamDoesNotHaveAccessToNamespace represents an error, where the Team is not the owner of that namespace (used i.e. when deleting a namespace)
+type ErrTeamDoesNotHaveAccessToNamespace struct {
+	NamespaceID int64
+	TeamID      int64
+}
+
+// IsErrTeamDoesNotHaveAccessToNamespace checks if an error is a ErrNamespaceDoesNotExist.
+func IsErrTeamDoesNotHaveAccessToNamespace(err error) bool {
+	_, ok := err.(ErrTeamDoesNotHaveAccessToNamespace)
+	return ok
+}
+
+func (err ErrTeamDoesNotHaveAccessToNamespace) Error() string {
+	return fmt.Sprintf("You need to have access to this namespace to do that [NamespaceID: %d, TeamID: %d]", err.NamespaceID, err.TeamID)
+}
+
 // ============
 // Team errors
 // ============
@@ -496,6 +512,22 @@ func (err ErrCannotDeleteLastTeamMember) Error() string {
 	return fmt.Sprintf("This user is already a member of that team. [Team ID: %d, User ID: %d]", err.TeamID, err.UserID)
 }
 
+// ErrTeamDoesNotHaveAccessToList represents an error, where the Team is not the owner of that List (used i.e. when deleting a List)
+type ErrTeamDoesNotHaveAccessToList struct {
+	ListID int64
+	TeamID int64
+}
+
+// IsErrTeamDoesNotHaveAccessToList checks if an error is a ErrListDoesNotExist.
+func IsErrTeamDoesNotHaveAccessToList(err error) bool {
+	_, ok := err.(ErrTeamDoesNotHaveAccessToList)
+	return ok
+}
+
+func (err ErrTeamDoesNotHaveAccessToList) Error() string {
+	return fmt.Sprintf("You need to have access to this List to do that [ListID: %d, TeamID: %d]", err.ListID, err.TeamID)
+}
+
 // ====================
 // User <-> List errors
 // ====================
diff --git a/models/team_list_delete.go b/models/team_list_delete.go
index 45748924c..3d14b6629 100644
--- a/models/team_list_delete.go
+++ b/models/team_list_delete.go
@@ -3,18 +3,22 @@ package models
 // Delete deletes a team <-> list relation based on the list & team id
 func (tl *TeamList) Delete() (err error) {
 
-	// Check if the list exists
-	_, err = GetListByID(tl.ListID)
-	if err != nil {
-		return
-	}
-
 	// Check if the team exists
 	_, err = GetTeamByID(tl.TeamID)
 	if err != nil {
 		return
 	}
 
+	// Check if the team has access to the list
+	has, err := x.Where("team_id = ? AND list_id = ?", tl.TeamID, tl.ListID).
+		Get(&TeamList{})
+	if err != nil {
+		return
+	}
+	if !has {
+		return ErrTeamDoesNotHaveAccessToList{TeamID: tl.TeamID, ListID: tl.ListID}
+	}
+
 	// Delete the relation
 	_, err = x.Where("team_id = ?", tl.TeamID).
 		And("list_id = ?", tl.ListID).
diff --git a/models/team_namespace_delete.go b/models/team_namespace_delete.go
index 62f7cab78..ff4078ebc 100644
--- a/models/team_namespace_delete.go
+++ b/models/team_namespace_delete.go
@@ -3,18 +3,22 @@ package models
 // Delete deletes a team <-> namespace relation based on the namespace & team id
 func (tn *TeamNamespace) Delete() (err error) {
 
-	// Check if the namespace exists
-	_, err = GetNamespaceByID(tn.NamespaceID)
-	if err != nil {
-		return
-	}
-
 	// Check if the team exists
 	_, err = GetTeamByID(tn.TeamID)
 	if err != nil {
 		return
 	}
 
+	// Check if the team has access to the namespace
+	has, err := x.Where("team_id = ? AND namespace_id = ?", tn.TeamID, tn.NamespaceID).
+		Get(&TeamNamespace{})
+	if err != nil {
+		return
+	}
+	if !has {
+		return ErrTeamDoesNotHaveAccessToNamespace{TeamID: tn.TeamID, NamespaceID: tn.NamespaceID}
+	}
+
 	// Delete the relation
 	_, err = x.Where("team_id = ?", tn.TeamID).
 		And("namespace_id = ?", tn.NamespaceID).
diff --git a/routes/crud/delete.go b/routes/crud/delete.go
index 919d6130e..1cb91606f 100644
--- a/routes/crud/delete.go
+++ b/routes/crud/delete.go
@@ -33,6 +33,9 @@ func (c *WebHandler) DeleteWeb(ctx echo.Context) error {
 		if models.IsErrListDoesNotExist(err) {
 			return echo.NewHTTPError(http.StatusNotFound, "This list does not exist.")
 		}
+		if models.IsErrTeamDoesNotHaveAccessToList(err) {
+			return echo.NewHTTPError(http.StatusBadRequest, "This team does not have access to the list.")
+		}
 
 		if models.IsErrTeamDoesNotExist(err) {
 			return echo.NewHTTPError(http.StatusNotFound, "This team does not exist.")