diff --git a/changelog/1135.misc.md b/changelog/1135.misc.md
new file mode 100644
index 000000000..e4d7f9009
--- /dev/null
+++ b/changelog/1135.misc.md
@@ -0,0 +1,2 @@
+Stringify `None` values for `message_id` and `sender_id` tracing tags to fix the
+`opentelemetry` warning about invalid type `NoneType` for these tags.
diff --git a/rasa_sdk/tracing/instrumentation/attribute_extractors.py b/rasa_sdk/tracing/instrumentation/attribute_extractors.py
index ff389438c..40fd0051f 100644
--- a/rasa_sdk/tracing/instrumentation/attribute_extractors.py
+++ b/rasa_sdk/tracing/instrumentation/attribute_extractors.py
@@ -25,7 +25,7 @@ def extract_attrs_for_action_executor(
     :param action_call: The `ActionCall` argument.
     :return: A dictionary containing the attributes.
     """
-    attributes = {"sender_id": action_call["sender_id"]}
+    attributes = {"sender_id": action_call.get("sender_id", "None")}
     action_name = action_call.get("next_action")
 
     if action_name:
diff --git a/rasa_sdk/tracing/utils.py b/rasa_sdk/tracing/utils.py
index 719b9f1ac..55b89dbfd 100644
--- a/rasa_sdk/tracing/utils.py
+++ b/rasa_sdk/tracing/utils.py
@@ -43,7 +43,7 @@ def set_span_attributes(span: Any, action_call: dict) -> None:
         "next_action": action_call.get("next_action"),
         "version": action_call.get("version"),
         "sender_id": tracker.get("sender_id"),
-        "message_id": tracker.get("latest_message", {}).get("message_id"),
+        "message_id": tracker.get("latest_message", {}).get("message_id", "None"),
     }
 
     if span.is_recording():