diff --git a/AUTHORS b/AUTHORS
index e5f2bd6d10..f77693fea5 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -424,6 +424,7 @@ answer newbie questions, and generally made Django that much better:
     james_027@yahoo.com
     James Aylett
     James Bennett <james@b-list.org>
+    James Gillard <jamesgillard@live.co.uk>
     James Murty
     James Tauber <jtauber@jtauber.com>
     James Timmins <jameshtimmins@gmail.com>
diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index 7269198674..97c6515d95 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -265,7 +265,7 @@ class ArrayLenTransform(Transform):
         return (
             "CASE WHEN %(lhs)s IS NULL THEN NULL ELSE "
             "coalesce(array_length(%(lhs)s, 1), 0) END"
-        ) % {"lhs": lhs}, params
+        ) % {"lhs": lhs}, params * 2
 
 
 @ArrayField.register_lookup
diff --git a/docs/releases/4.1.5.txt b/docs/releases/4.1.5.txt
index 57d46f204b..40af9eecb1 100644
--- a/docs/releases/4.1.5.txt
+++ b/docs/releases/4.1.5.txt
@@ -9,4 +9,7 @@ Django 4.1.5 fixes several bugs in 4.1.4.
 Bugfixes
 ========
 
-* ...
+* Fixed a long standing bug in the ``__len`` lookup for ``ArrayField`` that
+  caused a crash of model validation on
+  :attr:`Meta.constraints <django.db.models.Options.constraints>`
+  (:ticket:`34205`).
diff --git a/tests/postgres_tests/test_constraints.py b/tests/postgres_tests/test_constraints.py
index 74c07e4fab..a45aed153d 100644
--- a/tests/postgres_tests/test_constraints.py
+++ b/tests/postgres_tests/test_constraints.py
@@ -67,6 +67,16 @@ class SchemaTests(PostgreSQLTestCase):
             RangesModel.objects.create(ints=(20, 50))
         RangesModel.objects.create(ints=(10, 30))
 
+    def test_check_constraint_array_length(self):
+        constraint = CheckConstraint(
+            check=Q(field__len=1),
+            name="array_length",
+        )
+        msg = f"Constraint “{constraint.name}” is violated."
+        with self.assertRaisesMessage(ValidationError, msg):
+            constraint.validate(IntegerArrayModel, IntegerArrayModel())
+        constraint.validate(IntegerArrayModel, IntegerArrayModel(field=[1]))
+
     def test_check_constraint_daterange_contains(self):
         constraint_name = "dates_contains"
         self.assertNotIn(