xmlrpc, php7.2 migration, Warning: count(): Parameter must be. checking for an array should be enough here, other types aren't supported. closes https://github.com/opnsense/core/issues/3390

contrib/IXR/IXR_Library.php

@@ -417,7 +417,7 @@ EOD;
         $method = $this->callbacks[$methodname];
 
         // Perform the callback and send the response
-        if (count($args) == 1) {
+        if (is_array($args) && count($args) == 1) {
             // If only one paramater just send that instead of the whole array
             $args = $args[0];
         }