diff --git a/jupyter_ydoc/ynotebook.py b/jupyter_ydoc/ynotebook.py
index 523b147..3a678f1 100644
--- a/jupyter_ydoc/ynotebook.py
+++ b/jupyter_ydoc/ynotebook.py
@@ -250,7 +250,9 @@ def set(self, value: Dict) -> None:
             # clear document
             self._ymeta.clear()
             self._ycells.clear()
-            for key in [k for k in self._ystate.keys() if k not in ("dirty", "path")]:
+            for key in [
+                k for k in self._ystate.keys() if k not in ("dirty", "path", "document_id")
+            ]:
                 del self._ystate[key]
 
             # initialize document