fixed if fopen returns false typically on external storage

diff --git a/apps/files_encryption/lib/util.php b/apps/files_encryption/lib/util.php
index 48485cf2e86eb24b783a669de229040a951fbbba..2452f4c6ae3ef5f902fd922bc32b85dc10abe372 100644 (file)
--- a/apps/files_encryption/lib/util.php
+++ b/apps/files_encryption/lib/util.php
@@ -541,7 +541,7 @@ class Util {
                // we only need 24 byte from the last chunk
                $data = '';
                $handle = $this->view->fopen($path, 'r');
-               if (!fseek($handle, -24, SEEK_END)) {
+               if (is_resource($handle) && !fseek($handle, -24, SEEK_END)) {
                        $data = fgets($handle);
                }