diff --git a/api/core/variables/types.py b/api/core/variables/types.py
index e39237dba5..e79b2410bf 100644
--- a/api/core/variables/types.py
+++ b/api/core/variables/types.py
@@ -91,8 +91,6 @@ class SegmentType(StrEnum):
             return SegmentType.OBJECT
         elif isinstance(value, File):
             return SegmentType.FILE
-        elif isinstance(value, str):
-            return SegmentType.STRING
         else:
             return None
 
diff --git a/api/core/workflow/entities/variable_pool.py b/api/core/workflow/entities/variable_pool.py
index 646a9d3402..fbb8df6b01 100644
--- a/api/core/workflow/entities/variable_pool.py
+++ b/api/core/workflow/entities/variable_pool.py
@@ -152,7 +152,6 @@ class VariablePool(BaseModel):
             self.variable_dictionary[selector[0]] = {}
             return
         key, hash_key = self._selector_to_keys(selector)
-        hash_key = hash(tuple(selector[1:]))
         self.variable_dictionary[key].pop(hash_key, None)
 
     def convert_template(self, template: str, /):
diff --git a/api/tests/unit_tests/core/variables/test_segment.py b/api/tests/unit_tests/core/variables/test_segment.py
index cdc261fd42..4c8d983d20 100644
--- a/api/tests/unit_tests/core/variables/test_segment.py
+++ b/api/tests/unit_tests/core/variables/test_segment.py
@@ -376,7 +376,7 @@ class TestSegmentDumpAndLoad:
                 f"get_segment_discriminator failed for serialized form of type {type(variable)}"
             )
 
-    def test_invlaid_value_for_discriminator(self):
+    def test_invalid_value_for_discriminator(self):
         # Test invalid cases
         assert get_segment_discriminator({"value_type": "invalid"}) is None
         assert get_segment_discriminator({}) is None