diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 561f1d3bf..6a2998626 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -291,9 +291,8 @@ class Coder:
 
         if not self.done_messages:
             history_md = self.io.read_text(self.io.chat_history_file)
-            dump(history_md)
-            self.done_messages = self.summarizer.summarize_chat_history_markdown(history_md)
-            dump(self.done_messages)
+            if history_md:
+                self.done_messages = self.summarizer.summarize_chat_history_markdown(history_md)
 
         self.summarizer_thread = None
         self.summarized_done_messages = []