KeyError when extracting spells0.unity3d about unitypack HOT 2 CLOSED

diff --git a/unitypack/object.py b/unitypack/object.py
index edef4c8..8c7db82 100644
--- a/unitypack/object.py
+++ b/unitypack/object.py
@@ -32,7 +32,7 @@ class ObjectInfo:
                                except NotImplementedError:
                                        typename = script.type.type[5:-1]  # Capture type name in PPtr<...>
                        else:
-                               typename = self.asset.tree.type_trees[-150].type
+                               typename = self.asset.tree.type_trees[self.type_id].type
                        self.asset.typenames[self.type_id] = typename
                return self.asset.typenames[self.type_id]