Prevent catastrophic boot failure in wings when a server egg has bad data; closes pterodactyl#3055

Author: DaneEveritt

app/Services/Eggs/EggConfigurationService.php

@@ -98,6 +98,16 @@ protected function replacePlaceholders(Server $server, object $configs)
         // Normalize the output of the configuration for the new Wings Daemon to more
         // easily ingest, as well as make things more flexible down the road.
         foreach ($configs as $file => $data) {
+            // Try to head off any errors relating to parsing a set of configuration files
+            // or other JSON data for the egg. This should probably be blocked at the time
+            // of egg creation/update, but it isn't so this check will at least prevent a
+            // 500 error which would crash the entire Wings boot process.
+            //
+            // @see https://github.com/pterodactyl/panel/issues/3055
+            if (!is_object($data) || !isset($data->find)) {
+                continue;
+            }
+
             $append = array_merge((array) $data, ['file' => $file, 'replace' => []]);
 
             foreach ($this->iterate($data->find, $structure) as $find => $replace) {