diff --git a/backend/gradio_webrtc/webrtc.py b/backend/gradio_webrtc/webrtc.py
index ba47140..6cabbac 100644
--- a/backend/gradio_webrtc/webrtc.py
+++ b/backend/gradio_webrtc/webrtc.py
@@ -220,6 +220,7 @@ class StreamHandler(ABC):
     ) -> (
         tuple[int, np.ndarray]
         | AdditionalOutputs
+        | None
         | tuple[tuple[int, np.ndarray], AdditionalOutputs]
     ):
         pass
diff --git a/pyproject.toml b/pyproject.toml
index 7de8e4e..0f542c6 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -8,7 +8,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "gradio_webrtc"
-version = "0.0.16"
+version = "0.0.18"
 description = "Stream images in realtime with webrtc"
 readme = "README.md"
 license = "apache-2.0"