Ensure strpos is provided a string in App::runFrontend

- Address part of https://github.com/friendica/friendica/issues/12011#issuecomment-1338133783

diff --git a/src/App.php b/src/App.php
index 25770dd782e072e2add1532e68bb23667c7cf504..0d4e8880dd9d8373db64f8b0a60df3cd7325da83 100644 (file)
--- a/src/App.php
+++ b/src/App.php
@@ -631,10 +631,10 @@ class App
 
                        // ZRL
                        if (!empty($_GET['zrl']) && $this->mode->isNormal() && !$this->mode->isBackend() && !$this->session->getLocalUserId()) {
-                               // Only continue when the given profile link seems valid
+                               // Only continue when the given profile link seems valid.
                                // Valid profile links contain a path with "/profile/" and no query parameters
                                if ((parse_url($_GET['zrl'], PHP_URL_QUERY) == '') &&
-                                       strstr(parse_url($_GET['zrl'], PHP_URL_PATH), '/profile/')) {
+                                       strpos(parse_url($_GET['zrl'], PHP_URL_PATH) ?? '', '/profile/') !== false) {
                                        if ($this->session->get('visitor_home') != $_GET['zrl']) {
                                                $this->session->set('my_url', $_GET['zrl']);
                                                $this->session->set('authenticated', 0);