Ignore logged out players.

ProtocolLib/src/main/java/com/comphenix/protocol/CleanupStaticMembers.java

@@ -124,6 +124,7 @@ class CleanupStaticMembers {
 					reporter.reportWarning(this, 
 							Report.newBuilder(REPORT_CANNOT_RESET_FIELD).error(e).messageParam(field.getName(), e.getMessage())
 					);
+					e.printStackTrace();
 				}
 			}
 		}

ProtocolLib/src/main/java/com/comphenix/protocol/injector/player/ProxyPlayerInjectionHandler.java

@@ -343,6 +343,11 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 						
 						// Get socket and socket injector
 						SocketAddress address = injector.getAddress();
+						
+						// Ignore logged out players
+						if (address == null)
+							return null;
+						
 						SocketInjector previous = inputStreamLookup.peekSocketInjector(address);
 
 						// Close any previously associated hooks before we proceed
@@ -432,7 +437,11 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	
 	@Override
 	public void updatePlayer(Player player) {
-		SocketInjector injector = inputStreamLookup.peekSocketInjector(player.getAddress());
+		SocketAddress address = player.getAddress();
+		
+		// Ignore logged out players
+		if (address != null) {
+			SocketInjector injector = inputStreamLookup.peekSocketInjector(address);
 			
 			if (injector != null) {
 				injector.setUpdatedPlayer(player);
@@ -441,6 +450,7 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 						new BukkitSocketInjector(player));
 			}
 		}
+	}
 	
 	/**
 	 * Unregisters the given player.