diff --git a/rules-tests/PHPUnit120/Rector/Class_/AssertIsTypeMethodCallRector/Fixture/skip_non_phpunit_type.php.inc b/rules-tests/PHPUnit120/Rector/Class_/AssertIsTypeMethodCallRector/Fixture/skip_non_phpunit_type.php.inc
index 37a0ec8b..737c7641 100644
--- a/rules-tests/PHPUnit120/Rector/Class_/AssertIsTypeMethodCallRector/Fixture/skip_non_phpunit_type.php.inc
+++ b/rules-tests/PHPUnit120/Rector/Class_/AssertIsTypeMethodCallRector/Fixture/skip_non_phpunit_type.php.inc
@@ -1,7 +1,5 @@
 <?php
 
-// skip: non-string argument (enum case) should not crash
-
 namespace Rector\PHPUnit\Tests\PHPUnit120\Rector\Class_\AssertIsTypeMethodCallRector\Fixture;
 
 use PHPUnit\Framework\TestCase;
diff --git a/rules/CodeQuality/Rector/Expression/ConfiguredMockEntityToSetterObjectRector.php b/rules/CodeQuality/Rector/Expression/ConfiguredMockEntityToSetterObjectRector.php
index d506f469..8083b0bd 100644
--- a/rules/CodeQuality/Rector/Expression/ConfiguredMockEntityToSetterObjectRector.php
+++ b/rules/CodeQuality/Rector/Expression/ConfiguredMockEntityToSetterObjectRector.php
@@ -137,6 +137,10 @@ public function refactor(Node $node): ?array
         }
 
         if ($node instanceof Expression) {
+            if (! $assign instanceof Assign) {
+                return null;
+            }
+
             return $this->createForAssign($doctrineClass, $assign, $definedGettersArg->value, $node);
         }