Could not pass event AsyncPlayerChatEvent to GUIPlus v1.38

java.lang.IllegalStateException: InventoryOpenEvent may only be triggered synchronously.

at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:533) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.craftbukkit.v1_14_R1.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:1174) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.craftbukkit.v1_14_R1.event.CraftEventFactory.callInventoryOpenEvent(CraftEventFactory.java:1160) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.craftbukkit.v1_14_R1.entity.CraftHumanEntity.openCustomInventory(CraftHumanEntity.java:499) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.craftbukkit.v1_14_R1.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:374) ~[patched_1.14.4.jar:git-Paper-209]

at de.kinglol12345.GUIPlus.gui.GUIManager.openGUI(GUIManager.java:97) ~[?:?]

at de.kinglol12345.GUIPlus.gui.GUIManager.onChat(GUIManager.java:155) ~[?:?]

at de.kinglol12345.GUIPlus.listener.PlayerListener.onChat(PlayerListener.java:115) ~[?:?]

at com.destroystokyo.paper.event.executor.asm.generated.GeneratedEventExecutor605.execute(Unknown Source) ~[?:?]

at org.bukkit.plugin.EventExecutor.lambda$create$1(EventExecutor.java:69) ~[patched_1.14.4.jar:git-Paper-209]

at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:76) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:70) ~[patched_1.14.4.jar:git-Paper-209]

at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:545) ~[patched_1.14.4.jar:git-Paper-209]

at net.minecraft.server.v1_14_R1.PlayerConnection.chat(PlayerConnection.java:1713) ~[patched_1.14.4.jar:git-Paper-209]

at net.minecraft.server.v1_14_R1.PlayerConnection.a(PlayerConnection.java:1628) ~[patched_1.14.4.jar:git-Paper-209]

at net.minecraft.server.v1_14_R1.PacketPlayInChat$1.run(PacketPlayInChat.java:41) ~[patched_1.14.4.jar:git-Paper-209]

at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_212]

at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_212]

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_212]

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_212]

at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]