diff --git a/deker/tools/array.py b/deker/tools/array.py
index 3fd9c43..9ef340b 100644
--- a/deker/tools/array.py
+++ b/deker/tools/array.py
@@ -93,9 +93,11 @@ def generate_uid(array_type: ArrayType) -> str:
 
     :param array_type: Either array or varray
     """
-    assert isinstance(array_type, ArrayType), "Invalid argument type. Array type is required"
+    if not isinstance(array_type, ArrayType):
+        raise TypeError("Invalid argument type. Array type is required")
+
     namespace = uuid.NAMESPACE_X500 if array_type == ArrayType.array else uuid.NAMESPACE_OID
-    return str(uuid.uuid5(namespace, array_type + get_utc().isoformat()))
+    return str(uuid.uuid5(namespace, array_type.value + get_utc().isoformat()))
 
 
 def get_id(array: Any) -> str:
diff --git a/tests/test_cases/test_tools/test_tools.py b/tests/test_cases/test_tools/test_tools.py
index 0a5a7a0..0df3848 100644
--- a/tests/test_cases/test_tools/test_tools.py
+++ b/tests/test_cases/test_tools/test_tools.py
@@ -6,6 +6,7 @@
 
 from deker_local_adapters import LocalCollectionAdapter
 
+from deker.tools.array import generate_uid
 from tests.parameters.collection_params import CollectionParams
 
 from deker.collection import Collection
@@ -220,5 +221,11 @@ def test_convert_isoformat_attrs_raises(attrs):
         assert convert_iso_attrs_to_datetime(attrs)
 
 
+@pytest.mark.parametrize("array_type_arg", (list(), set(), tuple(), dict(), 1, "2", 3.4))
+def test_generate_id_raises(array_type_arg):
+    with pytest.raises(TypeError):
+        generate_uid(array_type_arg)
+
+
 if __name__ == "__main__":
     pytest.main()