diff --git a/src/Rector/EnforceDisableReturnValueGenerationForTestDoublesRector.php b/src/Rector/EnforceDisableReturnValueGenerationForTestDoublesRector.php
index 7fc9380..9a3f0a4 100644
--- a/src/Rector/EnforceDisableReturnValueGenerationForTestDoublesRector.php
+++ b/src/Rector/EnforceDisableReturnValueGenerationForTestDoublesRector.php
@@ -62,6 +62,10 @@ public function refactor(Node $node): ?Class_
             return null;
         }
 
+        if ($node->isAbstract()) {
+            return null;
+        }
+
         if ($this->attributeAnalyzer->hasPhpAttribute($node, DisableReturnValueGenerationForTestDoubles::class)) {
             return null;
         }
diff --git a/tests/rector/Rector/Fixture/abstract_without_attribute.php.inc b/tests/rector/Rector/Fixture/abstract_without_attribute.php.inc
new file mode 100644
index 0000000..7b9eb18
--- /dev/null
+++ b/tests/rector/Rector/Fixture/abstract_without_attribute.php.inc
@@ -0,0 +1,9 @@
+<?php
+
+namespace Tests\Rector\Lendable\PHPUnitExtensions\Rector\Fixture;
+
+use PHPUnit\Framework\TestCase;
+
+abstract class AbstractWithoutAttributeTest extends TestCase
+{
+}