diff --git a/apps/files_encryption/lib/proxy.php b/apps/files_encryption/lib/proxy.php
index 22b06da429c..2daf5b29b2e 100644
--- a/apps/files_encryption/lib/proxy.php
+++ b/apps/files_encryption/lib/proxy.php
@@ -343,7 +343,7 @@ 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;