diff --git a/CHANGELOG.md b/CHANGELOG.md
index 093e434..6fa54a9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Yii2 Active Record Save Relations Behavior Change Log
 
+## [1.4.1]
+### Fixed
+- Bug #24: Fix a regression introduced in 1.4.0 release where validation of hasOne relations was not triggered. (thx @dabkhazi)
+
 ## [1.4.0]
 ### Fixed
 - Bug #25: Fix for Yii 2.0.14 compatibility. Has many relations were not saved. (thx @SanChes-tanker)
diff --git a/src/SaveRelationsBehavior.php b/src/SaveRelationsBehavior.php
index 53a5c8c..0612c8a 100644
--- a/src/SaveRelationsBehavior.php
+++ b/src/SaveRelationsBehavior.php
@@ -291,10 +291,12 @@ class SaveRelationsBehavior extends Behavior
                             $relationModel = $model->{$relationName};
                             $p1 = $model->isPrimaryKey(array_keys($relation->link));
                             $p2 = $relationModel::isPrimaryKey(array_values($relation->link));
+                            $pettyRelationName = Inflector::camel2words($relationName, true);
                             if ($relationModel->getIsNewRecord() && $p1 && !$p2) {
                                 // Save Has one relation new record
-                                $pettyRelationName = Inflector::camel2words($relationName, true);
                                 $this->saveModelRecord($model->{$relationName}, $event, $pettyRelationName, $relationName);
+                            } else {
+                                $this->validateRelationModel($pettyRelationName, $relationName, $relationModel, $event);
                             }
                         } else {
                             // Save Has many relations new records
diff --git a/tests/SaveRelationsBehaviorTest.php b/tests/SaveRelationsBehaviorTest.php
index 9641440..f084c7c 100644
--- a/tests/SaveRelationsBehaviorTest.php
+++ b/tests/SaveRelationsBehaviorTest.php
@@ -11,6 +11,7 @@ use tests\models\Project;
 use tests\models\ProjectNoTransactions;
 use tests\models\Tag;
 use tests\models\User;
+use tests\models\UserProfile;
 use Yii;
 use yii\base\Model;
 use yii\db\Migration;
@@ -710,4 +711,18 @@ class SaveRelationsBehaviorTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals($project->company->name, "Tutu");
         $this->assertEquals($project->company->users[0]->username, "Someone Else");
     }
+
+    public function testHasOneRelationShouldTriggerOnBeforeValidateEvent()
+    {
+        $user = new User();
+        $user->setAttributes([
+            'username'   => 'Larry Page',
+            'company_id' => 3
+        ]);
+        $user->userProfile = new UserProfile();
+        $this->assertFalse($user->save(), 'User should not be saved');
+        $this->assertCount(1, $user->userProfile->getErrors());
+        $user->userProfile->bio = 'Lawrence Edward Page (born March 26, 1973) is an American computer scientist and Internet entrepreneur who co-founded Google with Sergey Brin.';
+        $this->assertTrue($user->save(), 'User could not be saved');
+    }
 }