diff --git a/apps/files_encryption/lib/proxy.php b/apps/files_encryption/lib/proxy.php
index b7e1599c1f..bae1fded53 100644
--- a/apps/files_encryption/lib/proxy.php
+++ b/apps/files_encryption/lib/proxy.php
@@ -344,7 +344,7 @@ class Proxy extends \OC_FileProxy {
 			\OC_FileProxy::$enabled = false;
 			$fileInfo = $view->getFileInfo($path);
 			\OC_FileProxy::$enabled = $proxyState;
-			if ($fileInfo['unencrypted_size'] > 0) {
+			if (isset($fileInfo['unencrypted_size']) && $fileInfo['unencrypted_size'] > 0) {
 				return $fileInfo['unencrypted_size'];
 			}
 			return $size;