- // Check all the subdomains of `requestHost`.
- while (requestHost.contains(".")) {
- if (adServersSet.contains(requestHost)) {
- requestHostIsAdServer = true;
- }
+ // Check all the subdomains of `requestHost` if it is not null.
+ if (requestHost != null) {
+ while (requestHost.contains(".")) {
+ if (adServersSet.contains(requestHost)) {
+ requestHostIsAdServer = true;
+ }