diff --git a/internal/api/authentication.go b/internal/api/authentication.go
index 94b5328f5..00ef58e5e 100644
--- a/internal/api/authentication.go
+++ b/internal/api/authentication.go
@@ -42,7 +42,7 @@ func authenticateHandler() func(http.Handler) http.Handler {
 
 			userID, err := manager.GetInstance().SessionStore.Authenticate(w, r)
 			if err != nil {
-				if errors.Is(err, session.ErrUnauthorized) {
+				if !errors.Is(err, session.ErrUnauthorized) {
 					http.Error(w, err.Error(), http.StatusInternalServerError)
 					return
 				}