diff --git a/python/semantic_kernel/contents/chat_history.py b/python/semantic_kernel/contents/chat_history.py
index a773c232c7bc..2be030a4c39e 100644
--- a/python/semantic_kernel/contents/chat_history.py
+++ b/python/semantic_kernel/contents/chat_history.py
@@ -219,7 +219,7 @@ def _prepare_for_add(
         """Prepare a message to be added to the history."""
         kwargs["role"] = role
 
-        if role == AuthorRole.TOOL and content and not items:
+        if role == AuthorRole.TOOL and content is not None and not items:
             tool_call_id = kwargs.pop("tool_call_id", None)
             function_name = kwargs.pop("function_name", "unknown")
             function_result_content = FunctionResultContent(