Error 5

[06:30:18] [Craft Scheduler Thread - 134/WARN]: [VkChat] Plugin VkChat v2.0 generated an exception while executing task 5
java.lang.NullPointerException: null
	at java.io.StringReader.<init>(StringReader.java:50) ~[?:1.8.0_222]
	at com.google.gson.JsonParser.parse(JsonParser.java:45) ~[patched_1.13.2.jar:git-Paper-642]
	at net.bombdash.VkChat.VkApi.getMessage(VkApi.java:128) ~[?:?]
	at net.bombdash.VkChat.VkApi$1.run(VkApi.java:205) ~[?:?]
	at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftTask.run(CraftTask.java:84) ~[patched_1.13.2.jar:git-Paper-642]
	at org.bukkit.craftbukkit.v1_13_R2.scheduler.CraftAsyncTask.run(CraftAsyncTask.java:52) ~[patched_1.13.2.jar:git-Paper-642]
	at com.destroystokyo.paper.ServerSchedulerReportingWrapper.run(ServerSchedulerReportingWrapper.java:22) ~[patched_1.13.2.jar:git-Paper-642]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_222]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_222]
	at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]