diff --git a/src/document/scene-document-validation.ts b/src/document/scene-document-validation.ts
index 3fadf579..88855fb4 100644
--- a/src/document/scene-document-validation.ts
+++ b/src/document/scene-document-validation.ts
@@ -5009,7 +5009,11 @@ function validateNpcEntity(
       );
     }
 
-    if (!isFiniteVec3(entity.targetAnchor.offset)) {
+    if (
+      typeof entity.targetAnchor.offset !== "object" ||
+      entity.targetAnchor.offset === null ||
+      !isFiniteVec3(entity.targetAnchor.offset)
+    ) {
       diagnostics.push(
         createDiagnostic(
           "error",