diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 07a0974b9..b10e79b3b 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -365,8 +365,8 @@ class Coder:
         if not self.summarizer.too_big(self.done_messages):
             return
 
-        assert self.summarizer_thread is None
-        assert self.summarized_done_messages is None
+        self.summarize_end()
+
         if self.verbose:
             self.io.tool_output("Starting to summarize chat history.")