diff --git a/installation_instruction/installation_instruction.py b/installation_instruction/installation_instruction.py
index a87b994..1d57aff 100644
--- a/installation_instruction/installation_instruction.py
+++ b/installation_instruction/installation_instruction.py
@@ -122,6 +122,7 @@ def __init__(self, config: str) -> None:
             self.misc = {key: schema[key] for key in schema if key != "schema"}
         else:
             self.schema = schema
+            self.misc = {}
         
         try:
             Draft202012Validator.check_schema(self.schema)