check for missing server in shutdown

receiver/webhookeventreceiver/receiver.go

@@ -133,7 +133,13 @@ func (er *eventReceiver) Start(_ context.Context, host component.Host) error {
 
 // Shutdown function manages receiver shutdown tasks. part of the receiver.Logs interface.
 func (er *eventReceiver) Shutdown(_ context.Context) error {
- err := er.server.Close()
+ var err error
+
+ // server must exist to be closed.
+ if er.server != nil {
+ err = er.server.Close()
+ }
+
  er.shutdownWG.Wait()
  return err
 }