Ensure client hints are always returned as array (#19855)

1 files changed, 4 insertions, 2 deletions

diff --git a/core/Tracker/Request.php b/core/Tracker/Request.php
index 50a8fa87e4..ad7a84adc7 100644
--- a/core/Tracker/Request.php
+++ b/core/Tracker/Request.php
@@ -635,12 +635,14 @@ class Request
         return Common::getRequestVar('ua', $default, 'string', $this->params);
     }
 
-    public function getClientHints()
+    public function getClientHints(): array
     {
         // use headers as default if no data was send with the tracking request
         $default = Http::getClientHintsFromServerVariables();
 
-        return Common::getRequestVar('uadata', $default, 'json', $this->params);
+        $clientHints = Common::getRequestVar('uadata', $default, 'json', $this->params);
+
+        return is_array($clientHints) ? $clientHints : [];
     }
 
     public function shouldUseThirdPartyCookie()