diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
index 3babf42..5ca84e8 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -190,7 +190,7 @@ public function setValue($values, $notify = TRUE) {
         // If the entity has been saved and we're trying to set both the
         // target_id and the entity values with a non-null target ID, then the
         // value for target_id should match the ID of the entity value.
-        if (!$this->entity->isNew() && $values['target_id'] !== NULL && ($entity_id !== $values['target_id'])) {
+        if (!$this->entity->isNew() && $values['target_id'] !== NULL && ($entity_id != $values['target_id'])) {
           throw new \InvalidArgumentException('The target id and entity passed to the entity reference item do not match.');
         }
       }
diff --git a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
index 90d4d1f..c4d2ad2 100644
--- a/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
+++ b/core/modules/field/tests/src/Kernel/EntityReference/EntityReferenceItemTest.php
@@ -534,4 +534,16 @@ public function testAutocreateValidation() {
     $this->assertEqual(0, count($errors));
   }
 
+  /**
+   * Tests setting integer target ID and entity at the same time.
+   */
+  public function testSetValueWithIntegerTargetIdAndEntity() {
+    $user = User::create(['name' => $this->randomString()]);
+    $user->save();
+    // Tests that setting an integer target ID together with the entity object
+    // succeeds and does not cause any exceptions.
+    // @see \Drupal\Core\Field\Plugin\Field\FieldType\EntityReferenceItem::setValue().
+    $entity = EntityTest::create(['user_id' => ['target_id' => (int) $user->id(), 'entity' => $user]]);
+  }
+
 }