diff --git a/agentaction/main.py b/agentaction/main.py
index 4566be7..c1080aa 100644
--- a/agentaction/main.py
+++ b/agentaction/main.py
@@ -30,7 +30,7 @@ def compose_action_prompt(action, values):
         A string representing the composed prompt.
     """
     prompt = action["prompt"]
-    builder = action["builder"]
+    builder = action.get("builder", None)
     if builder is not None:
         prompt = builder(values)
     return prompt
diff --git a/setup.py b/setup.py
index 65e72a9..a089b17 100644
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 
 setup(
     name="agentaction",
-    version="0.1.4",
+    version="0.1.5",
     description="Action chaining and history for agents",
     long_description=readme,  # added this line
     long_description_content_type="text/markdown",  # and this line