This was tested on a clean PocketMine-MP server using:
PMMP Version - 1.7dev-137 "[REDACTED]" (API 3.0.0-ALPHA9)
Server OS - Ubuntu 16.04 Server
Plugins Installed: DevTools, PmChair v1.03
Error received when clicking the chair after the first message appears.
2017-10-13 [04:35:02] [Server thread/CRITICAL]: Could not pass event 'pocketmine\event\player\PlayerInteractEvent' to 'PmChair v1.3': Undefined offset: 3 on maru\PmChair
Check uploaded server.log file for more details.
server.log
This was tested on a clean PocketMine-MP server using: PMMP Version - 1.7dev-137 "[REDACTED]" (API 3.0.0-ALPHA9) Server OS - Ubuntu 16.04 Server Plugins Installed: DevTools, PmChair v1.03
Error received when clicking the chair after the first message appears.
2017-10-13 [04:35:02] [Server thread/CRITICAL]: Could not pass event 'pocketmine\event\player\PlayerInteractEvent' to 'PmChair v1.3': Undefined offset: 3 on maru\PmChairCheck uploaded server.log file for more details. server.log