diff --git a/src/serialization/local-draft-storage.ts b/src/serialization/local-draft-storage.ts
index 829a6fd6..d42b04d8 100644
--- a/src/serialization/local-draft-storage.ts
+++ b/src/serialization/local-draft-storage.ts
@@ -253,8 +253,6 @@ export function saveSceneDocumentDraft(
   options: SaveSceneDocumentDraftOptions = {}
 ): SaveSceneDocumentDraftResult {
   try {
-    assertProjectDocumentIsValid(document);
-
     const maxSerializedBytes =
       options.maxSerializedBytes ?? DEFAULT_SCENE_DRAFT_MAX_SERIALIZED_BYTES;
     const estimatedDraftBytes = estimateProjectDraftSerializedBytes(
@@ -278,6 +276,8 @@ export function saveSceneDocumentDraft(
       };
     }
 
+    assertProjectDocumentIsValid(document);
+
     const rawDraft = JSON.stringify({
         format: EDITOR_DRAFT_ENVELOPE_FORMAT,
         document,