fix for SerializedFile - only try to get version_engine IF parent is a BundleFile

Author: K0lb3

UnityPy/files/File.py

@@ -76,7 +76,7 @@ def read_files(self, reader: EndianBinaryReader, files: list):
                 reader.read(node.size), offset=(reader.BaseOffset + node.offset)
             )
             f = ImportHelper.parse_file(
-                node_reader, self.parent, name, is_dependency=self.is_dependency
+                node_reader, self, name, is_dependency=self.is_dependency
             )
 
             if isinstance(f, (EndianBinaryReader, SerializedFile.SerializedFile)):

UnityPy/files/SerializedFile.py

@@ -1,7 +1,7 @@
 from ntpath import basename
 import re
 
-from . import File, ObjectReader
+from . import File, ObjectReader, BundleFile
 from ..enums import BuildTarget, ClassIDType, CommonString
 from ..streams import EndianBinaryReader, EndianBinaryWriter
 from ..helpers.TypeTreeHelper import TypeTreeNode
@@ -321,7 +321,8 @@ def set_version(self, string_version):
         if not string_version or string_version == "0.0.0":
             # weird case, but apparently can happen?
             # check "cant read Texture2D by 2020.3.13 f1 AssetBundle #77" for details
-            string_version = self.parent.version_engine
+            if isinstance(self.parent, BundleFile.BundleFile):
+                string_version = self.parent.version_engine
             if not string_version or string_version == "0.0.0":
                 string_version = config.get_fallback_version()
         build_type = re.findall(r"([^\d.])", string_version)