From 57c65c3ec62982326a02322fea0322313e7908d0 Mon Sep 17 00:00:00 2001
From: Joas Schilling <coding@schilljs.com>
Date: Thu, 5 Jan 2017 11:57:18 +0100
Subject: [PATCH] Make sure old instances don't break

Signed-off-by: Joas Schilling <coding@schilljs.com>
---
 lib/private/Memcache/Factory.php | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/private/Memcache/Factory.php b/lib/private/Memcache/Factory.php
index f3841d31679..8e62e020faa 100644
--- a/lib/private/Memcache/Factory.php
+++ b/lib/private/Memcache/Factory.php
@@ -83,7 +83,7 @@ class Factory implements ICacheFactory {
 
 		$missingCacheMessage = 'Memcache {class} not available for {use} cache';
 		$missingCacheHint = 'Is the matching PHP module installed and enabled?';
-		if (!$localCacheClass::isAvailable()) {
+		if (!class_exists($localCacheClass) || !$localCacheClass::isAvailable()) {
 			if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
 				// CLI should not hard-fail on broken memcache
 				$this->logger->info($missingCacheMessage, [
@@ -98,7 +98,7 @@ class Factory implements ICacheFactory {
 				]), $missingCacheHint);
 			}
 		}
-		if (!$distributedCacheClass::isAvailable()) {
+		if (!class_exists($distributedCacheClass) || !$distributedCacheClass::isAvailable()) {
 			if (\OC::$CLI && !defined('PHPUNIT_RUN')) {
 				// CLI should not hard-fail on broken memcache
 				$this->logger->info($missingCacheMessage, [
@@ -113,7 +113,7 @@ class Factory implements ICacheFactory {
 				]), $missingCacheHint);
 			}
 		}
-		if (!($lockingCacheClass && $lockingCacheClass::isAvailable())) {
+		if (!($lockingCacheClass && class_exists($distributedCacheClass) && $lockingCacheClass::isAvailable())) {
 			// don't fallback since the fallback might not be suitable for storing lock
 			$lockingCacheClass = self::NULL_CACHE;
 		}
-- 
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