diff --git a/frappe/__version__.py b/frappe/__version__.py
index 327d0f84fb..4e6731b58a 100644
--- a/frappe/__version__.py
+++ b/frappe/__version__.py
@@ -1,2 +1,2 @@
 from __future__ import unicode_literals
-__version__ = "6.23.2"
+__version__ = "6.23.3"
diff --git a/frappe/core/doctype/doctype/doctype.py b/frappe/core/doctype/doctype/doctype.py
index e874aadc6f..1eacbd64a4 100644
--- a/frappe/core/doctype/doctype/doctype.py
+++ b/frappe/core/doctype/doctype/doctype.py
@@ -237,8 +237,9 @@ class DocType(Document):
 
 		# a DocType's name should not start with a number or underscore
 		# and should only contain letters, numbers and underscore
-		if not re.match("^(?![\W])[^\d_][\w]+$", name, re.UNICODE):
-			frappe.throw(_("DocType's name should start with a letter and it can only consist of letters, numbers and underscores"))
+		is_a_valid_name = re.match("^(?![\W])[^\d_\s][\w ]+$", name, re.UNICODE)
+		if not is_a_valid_name:
+			frappe.throw(_("DocType's name should start with a letter and it can only consist of letters, numbers, spaces and underscores"), frappe.NameError)
 
 def validate_fields_for_doctype(doctype):
 	validate_fields(frappe.get_meta(doctype, cached=False))
diff --git a/frappe/core/doctype/doctype/test_doctype.py b/frappe/core/doctype/doctype/test_doctype.py
index 2419f0c7d1..c06bde9690 100644
--- a/frappe/core/doctype/doctype/test_doctype.py
+++ b/frappe/core/doctype/doctype/test_doctype.py
@@ -9,4 +9,23 @@ import unittest
 # test_records = frappe.get_test_records('DocType')
 
 class TestDocType(unittest.TestCase):
-	pass
+	def new_doctype(self, name):
+		return frappe.get_doc({
+			"doctype": "DocType",
+			"module": "Core",
+			"custom": 1,
+			"fields": [{"label": "Some Field", "fieldname": "some_fieldname", "fieldtype": "Data"}],
+			"permissions": [{"role": "System Manager", "read": 1}],
+			"name": name
+		})
+
+	def test_validate_name(self):
+		self.assertRaises(frappe.NameError, self.new_doctype("_Some DocType").insert)
+		self.assertRaises(frappe.NameError, self.new_doctype("8Some DocType").insert)
+		self.assertRaises(frappe.NameError, self.new_doctype("Some (DocType)").insert)
+		for name in ("Some DocType", "Some_DocType"):
+			if frappe.db.exists("DocType", name):
+				frappe.delete_doc("DocType", name)
+
+			doc = self.new_doctype(name).insert()
+			doc.delete()
diff --git a/frappe/hooks.py b/frappe/hooks.py
index 73615ee1af..5203f1a5bb 100644
--- a/frappe/hooks.py
+++ b/frappe/hooks.py
@@ -5,7 +5,7 @@ app_publisher = "Frappe Technologies Pvt. Ltd."
 app_description = "Full stack web framework with Python, Javascript, MariaDB, Redis, Node"
 
 app_icon = "octicon octicon-circuit-board"
-app_version = "6.23.2"
+app_version = "6.23.3"
 app_color = "orange"
 source_link = "https://github.com/frappe/frappe"
 app_license = "MIT"
diff --git a/frappe/utils/error.py b/frappe/utils/error.py
index d271bd208a..4994e13317 100644
--- a/frappe/utils/error.py
+++ b/frappe/utils/error.py
@@ -185,8 +185,8 @@ def collect_error_snapshots():
 
 def clear_old_snapshots():
 	"""Clear snapshots that are older than a month"""
-	frappe.delete_doc("Error Snapshot", frappe.db.sql_list("""select name from `tabError Snapshot`
-		where creation < date_sub(now(), interval 1 month) order by creation desc"""))
+	frappe.db.sql("""delete from `tabError Snapshot`
+		where creation < date_sub(now(), interval 1 month)""")
 
 	path = get_error_snapshot_path()
 	today = datetime.datetime.now()
diff --git a/frappe/utils/fixtures.py b/frappe/utils/fixtures.py
index c3fb932c13..2c56d953d6 100644
--- a/frappe/utils/fixtures.py
+++ b/frappe/utils/fixtures.py
@@ -14,7 +14,8 @@ def sync_fixtures(app=None):
 		apps = frappe.get_installed_apps()
 	for app in apps:
 		if os.path.exists(frappe.get_app_path(app, "fixtures")):
-			for fname in os.listdir(frappe.get_app_path(app, "fixtures")):
+			fixture_files = sorted(os.listdir(frappe.get_app_path(app, "fixtures")))
+			for fname in fixture_files:
 				if fname.endswith(".json") or fname.endswith(".csv"):
 					import_doc(frappe.get_app_path(app, "fixtures", fname), ignore_links=True, overwrite=True)
 
diff --git a/setup.py b/setup.py
index 841aaea605..69dddcb5c8 100644
--- a/setup.py
+++ b/setup.py
@@ -1,7 +1,7 @@
 from setuptools import setup, find_packages
 from pip.req import parse_requirements
 
-version = "6.23.2"
+version = "6.23.3"
 requirements = parse_requirements("requirements.txt", session="")
 
 setup(