From 42ca057cfdfcf4d84e4548b7dde4f60d8d3e126e Mon Sep 17 00:00:00 2001
From: Sebastian Husch Lee <10526848+sjrl@users.noreply.github.com>
Date: Fri, 2 Jan 2026 10:53:48 +0100
Subject: [PATCH] fix: Fix deserialization of `NamedEntityExtractor` when
 `pipeline_kwargs` has value of `None` (#10292)

* Fix sede bug in NamedEntityExtractor

* Add reno

* Use correct backticks
---
 .../extractors/named_entity_extractor.py      |  4 +--
 ...med-entity-extractor-84dcdde666b86cdf.yaml |  4 +++
 .../extractors/test_named_entity_extractor.py | 36 +++++++++++++++++++
 3 files changed, 42 insertions(+), 2 deletions(-)
 create mode 100644 releasenotes/notes/fix-sede-bug-named-entity-extractor-84dcdde666b86cdf.yaml

diff --git a/haystack/components/extractors/named_entity_extractor.py b/haystack/components/extractors/named_entity_extractor.py
index 341605c0e..dee67e749 100644
--- a/haystack/components/extractors/named_entity_extractor.py
+++ b/haystack/components/extractors/named_entity_extractor.py
@@ -249,8 +249,8 @@ class NamedEntityExtractor:
                 init_params["device"] = ComponentDevice.from_dict(init_params["device"])
             init_params["backend"] = NamedEntityExtractorBackend[init_params["backend"]]
 
-            hf_pipeline_kwargs = init_params.get("pipeline_kwargs", {})
-            deserialize_hf_model_kwargs(hf_pipeline_kwargs)
+            hf_pipeline_kwargs = init_params.get("pipeline_kwargs")
+            deserialize_hf_model_kwargs(hf_pipeline_kwargs or {})
             return default_from_dict(cls, data)
         except Exception as e:
             raise DeserializationError(f"Couldn't deserialize {cls.__name__} instance") from e
diff --git a/releasenotes/notes/fix-sede-bug-named-entity-extractor-84dcdde666b86cdf.yaml b/releasenotes/notes/fix-sede-bug-named-entity-extractor-84dcdde666b86cdf.yaml
new file mode 100644
index 000000000..f0b0459b6
--- /dev/null
+++ b/releasenotes/notes/fix-sede-bug-named-entity-extractor-84dcdde666b86cdf.yaml
@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Fixes deserializing an instance of ``NamedEntityExtractor`` when ``pipeline_kwargs`` is stored in the deserialization dict with the value of ``None``.
diff --git a/test/components/extractors/test_named_entity_extractor.py b/test/components/extractors/test_named_entity_extractor.py
index ad8b44413..2cb815c2d 100644
--- a/test/components/extractors/test_named_entity_extractor.py
+++ b/test/components/extractors/test_named_entity_extractor.py
@@ -28,6 +28,42 @@ def test_named_entity_extractor_backend():
         NamedEntityExtractor(backend="random_backend", model="dslim/bert-base-NER")
 
 
+def test_named_entity_extractor_to_dict():
+    extractor = NamedEntityExtractor(
+        backend=NamedEntityExtractorBackend.HUGGING_FACE,
+        model="dslim/bert-base-NER",
+        device=ComponentDevice.from_str("cuda:1"),
+    )
+
+    serde_data = extractor.to_dict()
+    assert serde_data == {
+        "type": "haystack.components.extractors.named_entity_extractor.NamedEntityExtractor",
+        "init_parameters": {
+            "backend": "HUGGING_FACE",
+            "model": "dslim/bert-base-NER",
+            "device": {"type": "single", "device": "cuda:1"},
+            "pipeline_kwargs": {"model": "dslim/bert-base-NER", "device": "cuda:1", "task": "ner"},
+            "token": {"type": "env_var", "env_vars": ["HF_API_TOKEN", "HF_TOKEN"], "strict": False},
+        },
+    }
+
+
+def test_named_entity_extractor_from_dict():
+    data = {
+        "type": "haystack.components.extractors.named_entity_extractor.NamedEntityExtractor",
+        "init_parameters": {
+            "backend": "HUGGING_FACE",
+            "model": "dslim/bert-base-NER",
+            "device": None,
+            "pipeline_kwargs": None,
+            "token": {"type": "env_var", "env_vars": ["HF_API_TOKEN", "HF_TOKEN"], "strict": False},
+        },
+    }
+    extractor = NamedEntityExtractor.from_dict(data)
+
+    assert extractor._backend.model_name == "dslim/bert-base-NER"
+
+
 def test_named_entity_extractor_serde():
     extractor = NamedEntityExtractor(
         backend=NamedEntityExtractorBackend.HUGGING_FACE,