diff --git a/tests/schema/__snapshots__/test_schema.ambr b/tests/schema/__snapshots__/test_schema.ambr
index 99d1c28b5..7eba0b855 100644
--- a/tests/schema/__snapshots__/test_schema.ambr
+++ b/tests/schema/__snapshots__/test_schema.ambr
@@ -2861,6 +2861,16 @@
     }),
   })
 # ---
+# name: test_schemas[schema/fixtures/extra_options-no_schema_with_empty_string_field]
+  ''
+# ---
+# name: test_schemas[schema/fixtures/extra_options-no_schema_with_empty_string_field].1
+  dict({
+    'validated_needs_count': 1,
+    'validation_warnings': dict({
+    }),
+  })
+# ---
 # name: test_schemas[schema/fixtures/extra_options-number_multiple_of]
   ''
 # ---
@@ -3001,6 +3011,16 @@
     }),
   })
 # ---
+# name: test_schemas[schema/fixtures/extra_options-schema_with_null_field]
+  ''
+# ---
+# name: test_schemas[schema/fixtures/extra_options-schema_with_null_field].1
+  dict({
+    'validated_needs_count': 1,
+    'validation_warnings': dict({
+    }),
+  })
+# ---
 # name: test_schemas[schema/fixtures/extra_options-set_type_string]
   ''
 # ---
diff --git a/tests/schema/fixtures/extra_options.yml b/tests/schema/fixtures/extra_options.yml
index e085e2ca7..eed1a5b6f 100644
--- a/tests/schema/fixtures/extra_options.yml
+++ b/tests/schema/fixtures/extra_options.yml
@@ -203,6 +203,49 @@ auto_inject_type_wrong_const:
               asil:
                 const: QM
 
+schema_with_null_field:
+  conf: |
+    extensions = ["sphinx_needs"]
+    needs_from_toml = "ubproject.toml"
+  ubproject: |
+    [needs]
+    schema_definitions_from_json = "schemas.json"
+    [[needs.extra_options]]
+    name = "asil"
+    schema.type = "string"
+  rst: |
+    .. impl:: title
+        :id: IMPL_1
+  schemas:
+    $defs: []
+    schemas:
+      - validate:
+          local:
+            properties:
+              asil:
+                const: QM
+
+no_schema_with_empty_string_field:
+  conf: |
+    extensions = ["sphinx_needs"]
+    needs_from_toml = "ubproject.toml"
+  ubproject: |
+    [needs]
+    schema_definitions_from_json = "schemas.json"
+    [[needs.extra_options]]
+    name = "asil"
+  rst: |
+    .. impl:: title
+        :id: IMPL_1
+  schemas:
+    $defs: []
+    schemas:
+      - validate:
+          local:
+            properties:
+              asil:
+                const: QM
+
 required_based_on_select_field_missing:
   conf: |
     extensions = ["sphinx_needs"]