Warning IllegalStateException

[Infinite-Blocks]

The following warning occurs upon stopping the server:

[17:01:36 WARN]: Exception in thread "WebSocketConnectReadThread-77" java.lang.IllegalStateException: zip file closed
[17:01:36 WARN]:        at java.base/java.util.zip.ZipFile.ensureOpen(ZipFile.java:831)
[17:01:36 WARN]:        at java.base/java.util.zip.ZipFile.getEntry(ZipFile.java:330)
[17:01:36 WARN]:        at java.base/java.util.jar.JarFile.getEntry(JarFile.java:518)
[17:01:36 WARN]:        at java.base/java.util.jar.JarFile.getJarEntry(JarFile.java:473)
[17:01:36 WARN]:        at org.bukkit.plugin.java.PluginClassLoader.findClass(PluginClassLoader.java:163)
[17:01:36 WARN]:        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:587)
[17:01:36 WARN]:        at org.bukkit.plugin.java.PluginClassLoader.loadClass0(PluginClassLoader.java:108)
[17:01:36 WARN]:        at org.bukkit.plugin.java.PluginClassLoader.loadClass(PluginClassLoader.java:103)
[17:01:36 WARN]:        at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:520)
[17:01:36 WARN]:        at EnjinCraft-Spigot.jar//com.enjin.enjincraft.spigot.libs.pusher.client.connection.websocket.WebSocketConnection.onError(WebSocketConnection.java:331)
[17:01:36 WARN]:        at EnjinCraft-Spigot.jar//com.enjin.enjincraft.spigot.libs.pusher.client.connection.websocket.WebSocketClientWrapper.onError(WebSocketClientWrapper.java:82)
[17:01:36 WARN]:        at EnjinCraft-Spigot.jar//com.enjin.enjincraft.spigot.libs.java_websocket.client.WebSocketClient.run(WebSocketClient.java:432)
[17:01:36 WARN]:        at java.base/java.lang.Thread.run(Thread.java:833)