diff --git a/CHANGELOG.md b/CHANGELOG.md
index b9280566f..cfe62344e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,10 @@ Changes are grouped as follows
 - `Fixed` for any bug fixes.
 - `Security` in case of vulnerabilities.
 
+## [7.70.7] - 2024-12-20
+### Fixed
+- Passing a valid but empty string as external_id no longer raises an error for certain SDK methods
+
 ## [7.70.6] - 2024-12-14
 ### Fixed
 - Updating a Sequence and repeating existing columns no longer raises a `CogniteDuplicatedError`.
diff --git a/cognite/client/_version.py b/cognite/client/_version.py
index f74ee2bfe..dd2e25be4 100644
--- a/cognite/client/_version.py
+++ b/cognite/client/_version.py
@@ -1,5 +1,5 @@
 from __future__ import annotations
 
-__version__ = "7.70.6"
+__version__ = "7.70.7"
 
 __api_subversion__ = "20230101"
diff --git a/cognite/client/utils/_identifier.py b/cognite/client/utils/_identifier.py
index b185b830b..3c93ef2e4 100644
--- a/cognite/client/utils/_identifier.py
+++ b/cognite/client/utils/_identifier.py
@@ -70,7 +70,7 @@ def as_primitive(self) -> str | int: ...
 class Identifier(Generic[T_ID]):
     def __init__(self, value: T_ID) -> None:
         if not isinstance(value, (int, str, InstanceId)):
-            raise TypeError(f"Expected id/external_id to be of type int or str, got {value} of type {type(id)}")
+            raise TypeError(f"Expected id/external_id to be of type int or str, got {value} of type {type(value)}")
         self.__value: T_ID = value
 
     def __eq__(self, other: Any) -> bool:
@@ -86,16 +86,16 @@ def __repr__(self) -> str:
 
     @classmethod
     def of_either(
-        cls, id: int | None, external_id: str | None, instance_id: InstanceId | tuple[str, str] | None = None
+        cls, id_: int | None, external_id: str | None, instance_id: InstanceId | tuple[str, str] | None = None
     ) -> Identifier:
-        if id is external_id is instance_id is None:
+        if id_ is external_id is instance_id is None:
             raise ValueError("Exactly one of id, external id, or instance_id must be specified, got neither")
-        elif id is not None:
+        elif id_ is not None:
             if external_id is not None or instance_id is not None:
                 raise ValueError("Exactly one of id, external id, or instance_id must be specified, got multiple")
-            elif not isinstance(id, int):
-                raise TypeError(f"Invalid id, expected int, got {type(id)}")
-            elif not 1 <= id <= MAX_VALID_INTERNAL_ID:
+            elif not isinstance(id_, int):
+                raise TypeError(f"Invalid id, expected int, got {type(id_)}")
+            elif not 1 <= id_ <= MAX_VALID_INTERNAL_ID:
                 raise ValueError(f"Invalid id, must satisfy: 1 <= id <= {MAX_VALID_INTERNAL_ID}")
         elif external_id is not None:
             if instance_id is not None:
@@ -107,7 +107,7 @@ def of_either(
                 instance_id = InstanceId.load(instance_id)
             if not isinstance(instance_id, InstanceId):
                 raise TypeError(f"Invalid instance_id, expected InstanceId, got {type(instance_id)}")
-        return Identifier(id or external_id or instance_id)
+        return Identifier(next(idx for idx in (id_, external_id, instance_id) if idx is not None))
 
     @classmethod
     def load(
diff --git a/pyproject.toml b/pyproject.toml
index a97a911e2..7e6f6e844 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,7 @@
 [tool.poetry]
 name = "cognite-sdk"
 
-version = "7.70.6"
+version = "7.70.7"
 
 description = "Cognite Python SDK"
 readme = "README.md"
diff --git a/tests/tests_unit/test_utils/test_identifier.py b/tests/tests_unit/test_utils/test_identifier.py
index 66c06aeed..79189521d 100644
--- a/tests/tests_unit/test_utils/test_identifier.py
+++ b/tests/tests_unit/test_utils/test_identifier.py
@@ -23,6 +23,8 @@ class TestIdentifier:
             (1, None, None, ("id", 1)),
             (MAX_VALID_INTERNAL_ID, None, None, ("id", MAX_VALID_INTERNAL_ID)),
             (None, "foo", None, ("external_id", "foo")),
+            # Bug prior to 7.70.7, empty string external ID would fail with wrong error message
+            (None, "", None, ("external_id", "")),
             (None, None, InstanceId("s", "extid"), ("instance_id", InstanceId("s", "extid"))),
         ),
     )