diff --git a/sdk/cosmos/azure-cosmos/CHANGELOG.md b/sdk/cosmos/azure-cosmos/CHANGELOG.md
index 24a11dd36193..075644d2aeaf 100644
--- a/sdk/cosmos/azure-cosmos/CHANGELOG.md
+++ b/sdk/cosmos/azure-cosmos/CHANGELOG.md
@@ -1,3 +1,8 @@
+## 4.0.1 (Unreleased)
+
+- Fixed error raised when a non string ID is used in an item. It now raises TypeError rather than AttributeError. Issue 11793 - thank you @Rabbit994.
+
+
 ## 4.0.0 (2020-05-20)
 
 - Stable release.
diff --git a/sdk/cosmos/azure-cosmos/azure/cosmos/_cosmos_client_connection.py b/sdk/cosmos/azure-cosmos/azure/cosmos/_cosmos_client_connection.py
index 3fa09e0ed51e..f9183e739762 100644
--- a/sdk/cosmos/azure-cosmos/azure/cosmos/_cosmos_client_connection.py
+++ b/sdk/cosmos/azure-cosmos/azure/cosmos/_cosmos_client_connection.py
@@ -31,6 +31,7 @@
 from urllib3.util.retry import Retry
 from azure.core.paging import ItemPaged  # type: ignore
 from azure.core import PipelineClient  # type: ignore
+from azure.core.exceptions import raise_with_traceback  # type: ignore
 from azure.core.pipeline.policies import (  # type: ignore
     HTTPPolicy,
     ContentDecodePolicy,
@@ -2480,11 +2481,14 @@ def __CheckAndUnifyQueryFormat(self, query_body):
     def __ValidateResource(resource):
         id_ = resource.get("id")
         if id_:
-            if id_.find("/") != -1 or id_.find("\\") != -1 or id_.find("?") != -1 or id_.find("#") != -1:
-                raise ValueError("Id contains illegal chars.")
-
-            if id_[-1] == " ":
-                raise ValueError("Id ends with a space.")
+            try:
+                if id_.find("/") != -1 or id_.find("\\") != -1 or id_.find("?") != -1 or id_.find("#") != -1:
+                    raise ValueError("Id contains illegal chars.")
+
+                if id_[-1] == " ":
+                    raise ValueError("Id ends with a space.")
+            except AttributeError:
+                raise_with_traceback(TypeError, message="Id type must be a string.")
 
     # Adds the partition key to options
     def _AddPartitionKey(self, collection_link, document, options):
diff --git a/sdk/cosmos/azure-cosmos/azure/cosmos/_version.py b/sdk/cosmos/azure-cosmos/azure/cosmos/_version.py
index e2f89349120a..db751d88b3e5 100644
--- a/sdk/cosmos/azure-cosmos/azure/cosmos/_version.py
+++ b/sdk/cosmos/azure-cosmos/azure/cosmos/_version.py
@@ -19,4 +19,4 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
-VERSION = "4.0.0"
+VERSION = "4.0.1"
diff --git a/sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token.py b/sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token.py
index 9efb03da0ac4..87cc629a9f51 100644
--- a/sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token.py
+++ b/sdk/cosmos/azure-cosmos/samples/access_cosmos_with_resource_token.py
@@ -14,7 +14,7 @@
 #    https://docs.microsoft.com/azure/cosmos-db/create-sql-api-python#create-a-database-account
 #
 # 2. Microsoft Azure Cosmos
-#    pip install azure-cosmos==4.0.0
+#    pip install azure-cosmos>=4.0.0
 # ----------------------------------------------------------------------------------------------------------
 # Sample - how to get and use resource token that allows restricted access to data
 # ----------------------------------------------------------------------------------------------------------
diff --git a/sdk/cosmos/azure-cosmos/test/test_crud.py b/sdk/cosmos/azure-cosmos/test/test_crud.py
index d8e4480381a3..ca9294428405 100644
--- a/sdk/cosmos/azure-cosmos/test/test_crud.py
+++ b/sdk/cosmos/azure-cosmos/test/test_crud.py
@@ -939,6 +939,11 @@ def test_document_upsert(self):
         self.assertEqual(created_document['id'],
                          document_definition['id'])
 
+        # test error for non-string id
+        with pytest.raises(TypeError):
+            document_definition['id'] = 7
+            created_collection.upsert_item(body=document_definition)
+
         # read documents after creation and verify updated count
         documents = list(created_collection.read_all_items())
         self.assertEqual(