diff --git a/tests/Integration/Execution/MutationExecutor/BelongsToTest.php b/tests/Integration/Execution/MutationExecutor/BelongsToTest.php
index a7fecddb25..bc4e29a672 100644
--- a/tests/Integration/Execution/MutationExecutor/BelongsToTest.php
+++ b/tests/Integration/Execution/MutationExecutor/BelongsToTest.php
@@ -112,6 +112,25 @@ public function testCreateAndConnectWithBelongsTo(): void
         ]);
     }
 
+    public function testConnectNonExisting(): void
+    {
+        $this
+            ->graphQL(/** @lang GraphQL */ '
+            mutation {
+                createTask(input: {
+                    name: "foo"
+                    user: {
+                        connect: 1
+                    }
+                }) {
+                    id
+                }
+            }
+            ')
+            ->dump()
+            ->assertGraphQLErrorMessage('Can not connect non-existing User 1');
+    }
+
     public function testBelongsToExplicitNullHasNoEffect(): void
     {
         $this->graphQL(/** @lang GraphQL */ '