diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index 6dc13b63e..966f75895 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -291,6 +291,8 @@ class Coder:
         self.io = io
         self.stream = stream
 
+        self.shell_commands = []
+
         if not auto_commits:
             dirty_commits = False