diff --git a/tests/lib/files/cache/cache.php b/tests/lib/files/cache/cache.php
index f272655925..527c1d1b2a 100644
--- a/tests/lib/files/cache/cache.php
+++ b/tests/lib/files/cache/cache.php
@@ -348,7 +348,9 @@ class Cache extends \PHPUnit_Framework_TestCase {
 	}
 
 	public function tearDown() {
-		$this->cache->clear();
+		if ($this->cache) {
+			$this->cache->clear();
+		}
 	}
 
 	public function setUp() {