diff --git a/atst/forms/task_order.py b/atst/forms/task_order.py
index fca7bcfd..80a31085 100644
--- a/atst/forms/task_order.py
+++ b/atst/forms/task_order.py
@@ -53,7 +53,11 @@ class CLINForm(FlaskForm):
 
     def validate(self, *args, **kwargs):
         valid = super().validate(*args, **kwargs)
-        if self.start_date.data > self.end_date.data:
+        if (
+            self.start_date.data
+            and self.end_date.data
+            and self.start_date.data > self.end_date.data
+        ):
             self.start_date.errors.append(
                 translate("forms.task_order.start_date_error")
             )