try a different fix

booking.earlyaccess_admin.inc

@@ -149,7 +149,10 @@ function booking_earlyaccess_csv_report() {
   $result = $codelist_query->execute();
 
   foreach ($result as $record) {
-    $header_array[] = $record->key;
+    foreach ($record as $key => $value) {
+      $header_array[] = $key;
+    }
+    break;
   }
 
   watchdog('booking_debug', "EarlyAccess CSV query result: @info", array('@info' => var_export( $result, TRUE)));