A few additional PHPStan rules (#5388)

A subset of
https://github.com/phpstan/phpstan-strict-rules

1 files changed, 1 insertions, 1 deletions

diff --git a/app/actualize_script.php b/app/actualize_script.php
index 67dcc9631..93479e74d 100755
--- a/app/actualize_script.php
+++ b/app/actualize_script.php
@@ -42,7 +42,7 @@ function notice(string $message): void {
 // Avoid having multiple actualization processes at the same time
 $mutexFile = TMP_PATH . '/actualize.freshrss.lock';
 $mutexTtl = 900; // seconds (refreshed before each new feed)
-if (file_exists($mutexFile) && ((time() - @filemtime($mutexFile)) > $mutexTtl)) {
+if (file_exists($mutexFile) && ((time() - (@filemtime($mutexFile) ?: 0)) > $mutexTtl)) {
 	unlink($mutexFile);
 }