Python: fix(core): handle None text safely in Message.text property

python/packages/core/agent_framework/_types.py

@@ -1932,7 +1932,9 @@ def text(self) -> str:
         Remarks:
             This property concatenates the text of all TextContent objects in Content.
         """
-        return " ".join(content.text for content in self.contents if content.type == "text")  # type: ignore[misc]
+        return " ".join(
+            content.text for content in self.contents if content.type == "text" and content.text is not None
+        )
 
 
 AgentRunInputs = str | Content | Message | Sequence[str | Content | Message]

python/packages/core/tests/core/test_types.py

@@ -2562,6 +2562,23 @@ def test_chat_message_complex_content_serialization():
     assert reconstructed.contents[2].type == "function_result"
 
 
+def test_message_text_handles_none_text_contents() -> None:
+    """Message.text should filter out text content whose text is None without raising TypeError."""
+    msg = Message(
+        role="assistant",
+        contents=[
+            Content("text", text=None),
+            Content.from_text("Hello"),
+            Content("text", text=None),
+            Content.from_text("world"),
+        ],
+    )
+    assert msg.text == "Hello world"
+
+    empty_msg = Message(role="user", contents=[Content("text", text=None)])
+    assert empty_msg.text == ""
+
+
 def test_message_roundtrip_preserves_compaction_annotation_dict() -> None:
     message = Message(
         role="assistant",