エラー修正

scripts/langchainapi.py

@@ -5,7 +5,7 @@ import os
 import sys
 import json
 from langchain_community.llms import GPT4All, LlamaCpp
-from langchain.memory import ConversationBufferMemory
+from langchain.memory import ConversationBufferMemory, ChatMessageHistory
 from langchain.schema import (
     AIMessage,
     HumanMessage,
@@ -42,7 +42,13 @@ class LangChainApi:
 
     def __init__(self, **kwargs):
         self.backend = None
-        self.memory = None
+
+        self.memory = ConversationBufferMemory(
+            human_prefix="Human",
+            ai_prefix="AI", 
+            memory_key="history",
+            return_messages=True,
+        )
 
         self.load_settings(**kwargs)
 
@@ -72,13 +78,6 @@ class LangChainApi:
             )
             is_chat = False
 
-        self.memory = ConversationBufferMemory(
-            human_prefix="Human",
-            ai_prefix="AI", 
-            memory_key="history",
-            return_messages=True,
-        )
-
         self.pydantic_parser = PydanticOutputParser(pydantic_object=Txt2ImgModel)
 
         if not is_chat:
@@ -176,6 +175,8 @@ If you understand, please reply to the following:<|end_of_turn|>
         return False
 
     def get_log(self):
+        if self.memory is None:
+            return '[]'
         ret_messages = []
         for mes in self.memory.chat_memory:
             if type(mes) is HumanMessage: