diff --git a/frappe/core/doctype/version/version.py b/frappe/core/doctype/version/version.py
index 25c3c096b6..d3ee8ca22d 100644
--- a/frappe/core/doctype/version/version.py
+++ b/frappe/core/doctype/version/version.py
@@ -4,7 +4,7 @@
 import json
 
 import frappe
-from frappe.model import no_value_fields, table_fields
+from frappe.model import datetime_fields, no_value_fields, table_fields
 from frappe.model.document import Document
 from frappe.utils import cstr
 
@@ -120,6 +120,10 @@ def get_diff(old, new, for_child=False, compare_cancelled=False):
 		if df.fieldtype in ("Link", "Dynamic Link"):
 			old_value, new_value = cstr(old_value), cstr(new_value)
 
+		if df.fieldtype in datetime_fields:
+			if old_value is None and new_value == "":
+				new_value = None
+
 		if not for_child and df.fieldtype in table_fields:
 			old_rows_by_name = {}
 			for d in old_value: