diff --git a/lmformatenforcer/characterlevelparser.py b/lmformatenforcer/characterlevelparser.py
index 1958138..186eab9 100644
--- a/lmformatenforcer/characterlevelparser.py
+++ b/lmformatenforcer/characterlevelparser.py
@@ -127,8 +127,11 @@ def get_allowed_characters(self) -> str:
     def can_end(self) -> bool:
         return any([parser.can_end() for parser in self.parsers])
     
-    def shortcut_key(self) -> Optional[str]:
-        return self.parsers[0].shortcut_key() if len(self.parsers) == 1 else None
+    def shortcut_key(self) -> Optional[Hashable]:
+        unique_shortcut_keys = set(parser.shortcut_key() for parser in self.parsers)
+        if len(unique_shortcut_keys) == 1:
+            return next(iter(unique_shortcut_keys))
+        return None
     
     def cache_key(self) -> Optional[Hashable]:
         all_cache_keys = tuple(parser.cache_key() for parser in self.parsers)
diff --git a/lmformatenforcer/jsonschemaparser.py b/lmformatenforcer/jsonschemaparser.py
index a8082cf..d5d67a9 100644
--- a/lmformatenforcer/jsonschemaparser.py
+++ b/lmformatenforcer/jsonschemaparser.py
@@ -160,7 +160,8 @@ def __init__(self, root: JsonSchemaParser):
 
 
 def _merge_object_schemas(base_schema: JsonSchemaObject, option_schema: JsonSchemaObject) -> JsonSchemaObject:
-    for property_name, property_value in base_schema.properties.items():
+    base_schema_properties = base_schema.properties or {}
+    for property_name, property_value in base_schema_properties.items():
         # We assume that if a property exists in both base and option, the option version will be
         # more specific, therefore we only take missing entries
         if property_name not in option_schema.properties:
@@ -201,13 +202,13 @@ def get_parser(
             max_length=value_schema.maxLength,
             pattern=value_schema.pattern,
         )
+    if value_schema.oneOf:
+        # We create a combined object schema for each option that includes the information from the parent
+        # And then create a UnionParser based on the combined options
+        merged_schemas = [_merge_object_schemas(value_schema, option_schema) for option_schema in value_schema.oneOf]
+        object_parsing_options = [ObjectParsingState(merged_schema, parsing_state) for merged_schema in merged_schemas]
+        return UnionParser(object_parsing_options)
     elif value_schema.type == "object":
-        if value_schema.oneOf:
-            # We create a combined object schema for each option that includes the information from the parent
-            # And then create a UnionParser based on the combined options
-            merged_schemas = [_merge_object_schemas(value_schema, option_schema) for option_schema in value_schema.oneOf]
-            object_parsing_options = [ObjectParsingState(merged_schema, parsing_state) for merged_schema in merged_schemas]
-            return UnionParser(object_parsing_options)
         return ObjectParsingState(value_schema, parsing_state)
     elif value_schema.type == None and value_schema.ref:
         value_class_name = value_schema.ref.split('/')[-1]
diff --git a/tests/test_jsonschemaparser.py b/tests/test_jsonschemaparser.py
index e58bd6b..554f274 100644
--- a/tests/test_jsonschemaparser.py
+++ b/tests/test_jsonschemaparser.py
@@ -792,4 +792,9 @@ def test_invalid_number_formats_with_leading_zeros(test_input):
     ('{"value": -9007199254740992}', True),
 ])
 def test_number_edge_cases(test_input, expected_success):
-    _test_json_schema_parsing_with_string(test_input, schema, expected_success)
\ No newline at end of file
+    _test_json_schema_parsing_with_string(test_input, schema, expected_success)
+
+def test_chinese_oneof_schema():
+    test_schema = { "$schema": "http://json-schema.org/draft-07/schema#", "type": "array", "items": { "oneOf": [ { "type": "object", "properties": { "trigger": { "type": "string" }, "event_type": { "enum": [ "公司上市" ] }, "arguments": { "type": "array", "items": { "type": "object", "properties": { "role": { "enum": [ "上市公司", "证券代码", "环节", "披露时间", "发行价格", "事件时间", "市值", "募资金额" ] }, "argument": { "type": "string" } }, "required": [ "role", "argument" ] } } }, "required": [ "trigger", "event_type", "arguments" ] }, { "type": "object", "properties": { "trigger": { "type": "string" }, "event_type": { "enum": [ "被约谈" ] }, "arguments": { "type": "array", "items": { "type": "object", "properties": { "role": { "enum": [ "公司名称", "披露时间", "被约谈时间", "约谈机构" ] }, "argument": { "type": "string" } }, "required": [ "role", "argument" ] } } }, "required": [ "trigger", "event_type", "arguments" ] } ] } }
+    correct_output = """[{"trigger": "IPO", "event_type": "公司上市", "arguments": [{"role": "上市公司", "argument": "理想汽车"}, {"role": "披露时间", "argument": "30日"}, {"role": "发行价格", "argument": "8-10美元"}, {"role": "环节", "argument": "筹备上市"}]}]"""
+    _test_json_schema_parsing_with_string(correct_output, test_schema, True)