Server won't close if GS4 listener is enabled

server won't close with enabled GS4 listener on stop command.

What I expected to happen was...:
server stops and exit after "stop" command on console

What actually happened was...:
server hangs and won't exit after:

[19:41:33] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:overworld
[19:41:33] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved
[19:41:33] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:the_end
[19:41:33] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved
[19:41:33] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:the_nether
[19:41:33] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved

Steps to Reproduce:
1. enable query port in server.properties

enable-query=true

2. start server

[19:46:58] [Server thread/INFO]: Done (8.822s)! For help, type "help"
[19:46:58] [Server thread/INFO]: Starting GS4 status listener
[19:46:59] [Query Listener #1/INFO]: Query running on 0.0.0.0:25565

3. enter stop command

[19:47:06] [Server thread/INFO]: Stopping the server
[19:47:06] [Server thread/INFO]: Stopping server
[19:47:06] [Server thread/INFO]: Saving players
[19:47:06] [Server thread/INFO]: Saving worlds
[19:47:06] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:overworld
[19:47:07] [Server thread/INFO]: ThreadedAnvilChunkStorage (world): All chunks are saved
[19:47:07] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:the_nether
[19:47:07] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM-1): All chunks are saved
[19:47:07] [Server thread/INFO]: Saving chunks for level 'world'/minecraft:the_end
[19:47:07] [Server thread/INFO]: ThreadedAnvilChunkStorage (DIM1): All chunks are saved

4. server hangs and won't exit (java proccess is still alive)