diff --git a/bot/session_manager.py b/bot/session_manager.py
index cb05b68..ce189ed 100644
--- a/bot/session_manager.py
+++ b/bot/session_manager.py
@@ -50,6 +50,9 @@ class SessionManager(object):
             如果session_id不在sessions中，创建一个新的session并添加到sessions中
             如果system_prompt不会空，会更新session的system_prompt并重置session
         '''
+        if session_id is None:
+            return self.sessioncls(session_id, system_prompt, **self.session_args)
+        
         if session_id not in self.sessions:
             self.sessions[session_id] = self.sessioncls(session_id, system_prompt, **self.session_args)
         elif system_prompt is not None:  # 如果有新的system_prompt，更新并重置session
diff --git a/channel/chat_channel.py b/channel/chat_channel.py
index 5ed0886..a89d0ad 100644
--- a/channel/chat_channel.py
+++ b/channel/chat_channel.py
@@ -111,11 +111,11 @@ class ChatChannel(Channel):
                                                   
             img_match_prefix = check_prefix(content, conf().get('image_create_prefix'))
             if img_match_prefix:
-                content = content.replace(img_match_prefix, '', 1).strip()
+                content = content.replace(img_match_prefix, '', 1)
                 context.type = ContextType.IMAGE_CREATE
             else:
                 context.type = ContextType.TEXT
-            context.content = content
+            context.content = content.strip()
             if 'desire_rtype' not in context and conf().get('always_reply_voice') and ReplyType.VOICE not in self.NOT_SUPPORT_REPLYTYPE:
                 context['desire_rtype'] = ReplyType.VOICE
         elif context.type == ContextType.VOICE: