diff --git a/src/clew/extract_renpy_ast.py b/src/clew/extract_renpy_ast.py
index c2b3128..537206c 100644
--- a/src/clew/extract_renpy_ast.py
+++ b/src/clew/extract_renpy_ast.py
@@ -24,13 +24,13 @@ except NameError:
 
 
 RPYC2_HEADER = b"RENPY RPC2"
-SCHEMA = "clew-ast-dump-v1"
+SCHEMA = "clew-renpy-ast-v1"
 
 
 def parse_args(argv):
     parser = argparse.ArgumentParser(
-        prog="dump-ast",
-        description="Dump compiled Ren'Py script ASTs as generic JSON.",
+        prog="extract-renpy-ast",
+        description="Extract compiled Ren'Py script ASTs as generic JSON.",
     )
     parser.add_argument("--game-root", required=True)
     parser.add_argument("--input", required=True)
@@ -169,6 +169,8 @@ class Dumper(object):
                 continue
             try:
                 slot_value = getattr(value, slot)
+            except AttributeError:
+                continue
             except Exception as error:
                 attributes[slot] = {
                     "type": "attribute-error",