diff --git a/src/Tests/TestRunner.php b/src/Tests/TestRunner.php
index ea5499f..0c8200b 100644
--- a/src/Tests/TestRunner.php
+++ b/src/Tests/TestRunner.php
@@ -170,7 +170,7 @@ private function setBasedir()
 		{
 			throw new TestException('composer.json is unreadable or invalid json');
 		}
-		$this->namespace = $composer->name;
+		$this->namespace = $composer->name ?? '';
 	}
 
 	/**