diff --git a/assemblyai/types.py b/assemblyai/types.py
index 92377f6..111e0c7 100644
--- a/assemblyai/types.py
+++ b/assemblyai/types.py
@@ -2161,16 +2161,16 @@ class Word(BaseModel):
     channel: Optional[str] = None
 
     # This is a workaround to address an issue where sentiment_analysis_results
-    # may return contains sentiments where `start` is null.
+    # may return contains sentiments where `start` or `end` is null.
     if pydantic_v2:
 
-        @field_validator("start", mode="before")
+        @field_validator("start", "end", mode="before")
         def set_start_default(cls, v):
             return 0 if v is None else v
 
     else:
 
-        @validator("start", pre=True)
+        @validator("start", "end", pre=True)
         def set_start_default(cls, v):
             return 0 if v is None else v
 
diff --git a/tests/unit/test_sentiment_analysis.py b/tests/unit/test_sentiment_analysis.py
index 2d86c01..125eb12 100644
--- a/tests/unit/test_sentiment_analysis.py
+++ b/tests/unit/test_sentiment_analysis.py
@@ -106,3 +106,34 @@ def test_sentiment_analysis_null_start(httpx_mock: HTTPXMock):
         transcript.sentiment_analysis,
     ):
         assert transcript_sentiment_result.start == 0
+
+
+def test_sentiment_analysis_null_end(httpx_mock: HTTPXMock):
+    """
+    Tests that `end` converts null values to 0.
+    """
+    mock_response = {
+        "audio_url": "https://example/audio.mp3",
+        "status": "completed",
+        "sentiment_analysis_results": [
+            {
+                "text": "hi",
+                "start": 100,
+                "end": None,
+                "confidence": 0.99,
+                "sentiment": "POSITIVE",
+            }
+        ],
+    }
+    request_body, transcript = unit_test_utils.submit_mock_transcription_request(
+        httpx_mock,
+        mock_response=mock_response,
+        config=aai.TranscriptionConfig(sentiment_analysis=True),
+    )
+
+    for response_sentiment_result, transcript_sentiment_result in zip(
+        mock_response["sentiment_analysis_results"],
+        transcript.sentiment_analysis,
+    ):
+        assert transcript_sentiment_result.start == 100
+        assert transcript_sentiment_result.end == 0