just remove session cookie, if its set

mod.ts

@@ -308,7 +308,9 @@ export class HTTPServer {
           maxAge: this.settings.sessionExpire ?? undefined,
         });
       } else {
-        routeReply.cookie("session", undefined);
+        if (routeRequest.cookie("session")) {
+          routeReply.cookie("session", undefined);
+        }
       }
     }
   }
@@ -468,6 +470,7 @@ export class RouteRequest {
       try {
         this.session = JSON.parse(decodedSessionCookie);
       } catch (_err) {
+        console.log(_err);
         // Ignore if sessionCookie is not in JSON format
       }
     }