From 2656a41a92d8682c13ce05c4f844e21ab828a587 Mon Sep 17 00:00:00 2001
From: aviruthen <91846056+aviruthen@users.noreply.github.com>
Date: Mon, 23 Mar 2026 12:42:06 -0400
Subject: [PATCH] fix: Pipeline TypeError: can only concatenate list (not
 "NoneType") to list Using Sou (#5518)

---
 .../src/sagemaker/core/workflow/utilities.py  |  4 ++-
 .../tests/unit/workflow/test_utilities.py     | 27 +++++++++++++++++++
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/sagemaker-core/src/sagemaker/core/workflow/utilities.py b/sagemaker-core/src/sagemaker/core/workflow/utilities.py
index c07a31c51e..6f35c23480 100644
--- a/sagemaker-core/src/sagemaker/core/workflow/utilities.py
+++ b/sagemaker-core/src/sagemaker/core/workflow/utilities.py
@@ -211,7 +211,9 @@ def get_processing_code_hash(code: str, source_dir: str, dependencies: List[str]
     """
 
     # FrameworkProcessor
-    if source_dir:
+    dependencies = dependencies or []
+
+
         source_dir_url = urlparse(source_dir)
         if source_dir_url.scheme == "" or source_dir_url.scheme == "file":
             # Include code in the hash when possible
diff --git a/sagemaker-core/tests/unit/workflow/test_utilities.py b/sagemaker-core/tests/unit/workflow/test_utilities.py
index 5e9ed7bbbd..3050e28f2f 100644
--- a/sagemaker-core/tests/unit/workflow/test_utilities.py
+++ b/sagemaker-core/tests/unit/workflow/test_utilities.py
@@ -249,6 +249,33 @@ def test_get_processing_code_hash_s3_uri(self):
 
         assert result is None
 
+    def test_get_processing_code_hash_with_none_dependencies(self):
+        """Test get_processing_code_hash with None dependencies does not raise TypeError"""
+        with tempfile.TemporaryDirectory() as temp_dir:
+            code_file = Path(temp_dir, "script.py")
+            code_file.write_text("print('hello')")
+
+            result = get_processing_code_hash(
+                code=str(code_file), source_dir=temp_dir, dependencies=None
+            )
+
+            assert result is not None
+            assert len(result) == 64
+
+    def test_get_processing_code_hash_code_only_with_none_dependencies(self):
+        """Test get_processing_code_hash with code only and None dependencies"""
+        with tempfile.NamedTemporaryFile(mode="w", suffix=".py", delete=False) as f:
+            f.write("print('hello')")
+            temp_file = f.name
+
+        try:
+            result = get_processing_code_hash(code=temp_file, source_dir=None, dependencies=None)
+
+            assert result is not None
+            assert len(result) == 64
+        finally:
+            os.unlink(temp_file)
+
     def test_get_processing_code_hash_with_dependencies(self):
         """Test get_processing_code_hash with dependencies"""
         with tempfile.TemporaryDirectory() as temp_dir: