Warning when used w/ ITX Genisys core

[frankblob]

[09:30:32] [Server thread/INFO]:
PocketMine-iTX Genisys is a fork of PocketMine-MP, made by iTX Technologies LLC.
Version: 1.1dev-276
Target client Version: v0.14.x alpha
[09:30:32] [Server thread/INFO]: Loading pocketmine.yml...
[09:30:32] [Server thread/INFO]: Loading genisys.yml...
[09:30:32] [Server thread/INFO]: Loading server properties...
[09:30:32] [Server thread/INFO]: Starting Minecraft: PE server version v0.14.x alpha
[09:30:32] [Server thread/INFO]: Opening server on 0.0.0.0:41122
[09:30:32] [Server thread/INFO]: This server is running Genisys version 1.1dev-276 "Ikaros" (API 2.0.0)
[...]
[09:30:33] [Server thread/INFO]: Enabling WorldGM v9
[09:30:33] [Server thread/INFO]: [WorldGM] Loaded and enabled successfully
Warning: mkdir(): File exists in phar:///home/genisys/PocketMine-MP.phar/src/pocketmine/plugin/PluginBase.php on line 207

Running on PHP 7, Ubuntu 14.04.4-minimal, Genisys-PM 1.1-dev276.