diff --git a/rendercv/data/models/curriculum_vitae.py b/rendercv/data/models/curriculum_vitae.py
index 0c8ecba7..69be7e4f 100644
--- a/rendercv/data/models/curriculum_vitae.py
+++ b/rendercv/data/models/curriculum_vitae.py
@@ -112,7 +112,7 @@ def get_characteristic_entry_attributes(
 
 
 def get_entry_type_name_and_section_validator(
-    entry: dict[str, str | list[str]] | str | type, entry_types: tuple[type]
+    entry: Optional[dict[str, str | list[str]] | str | type], entry_types: tuple[type]
 ) -> tuple[str, type[SectionBase]]:
     """Get the entry type name and the section validator based on the entry.
 
@@ -156,6 +156,10 @@ def get_entry_type_name_and_section_validator(
         entry_type_name = "TextEntry"
         section_type = create_a_section_validator(str)
 
+    elif entry is None:
+        message = "The entry cannot be a null value."
+        raise ValueError(message)
+
     else:
         # Then the entry is already initialized with a data model:
         entry_type_name = entry.__class__.__name__
diff --git a/tests/test_data.py b/tests/test_data.py
index 3fc52664..94ef0cb5 100644
--- a/tests/test_data.py
+++ b/tests/test_data.py
@@ -967,3 +967,17 @@ def test_bold_keywords():
             elif section.title == "test7":
                 assert "**test_keyword_3**" in entry.details
                 assert "**test_keyword_4**" in entry.details
+
+
+def test_none_entries():
+    with pytest.raises(pydantic.ValidationError):
+        data.RenderCVDataModel(
+            cv=data.CurriculumVitae(
+                name="John Doe",
+                sections={
+                    "test": [
+                        None,
+                    ],
+                },
+            )
+        )