Try to fix a weird null case

Author: dmulloy2

modules/API/src/main/java/com/comphenix/protocol/utility/MinecraftFields.java

@@ -47,6 +47,7 @@ public static Object getNetworkManager(Player player) {
 	 * @return The player connection.
 	 */
 	public static Object getPlayerConnection(Player player) {
+		Preconditions.checkNotNull(player, "player cannot be null!");
 		return getPlayerConnection(BukkitUnwrapper.getInstance().unwrapItem(player));
 	}
 

modules/ProtocolLib/src/main/java/com/comphenix/protocol/injector/netty/ChannelInjector.java

@@ -671,7 +671,7 @@ private void invokeSendPacket(Object packet) {
 				MinecraftMethods.getSendPacketMethod().invoke(getPlayerConnection(), packet);
 			}
 		} catch (Throwable ex) {
-			ProtocolLibrary.getErrorReporter().reportWarning(factory.getPlugin(),
+			ProtocolLibrary.getErrorReporter().reportWarning(this,
 					Report.newBuilder(REPORT_CANNOT_SEND_PACKET).messageParam(packet, playerName).error(ex).build());
 		}
 	}
@@ -716,7 +716,7 @@ public Protocol getCurrentProtocol() {
 	 */
 	private Object getPlayerConnection() {
 		if (playerConnection == null) {
-			playerConnection = MinecraftFields.getPlayerConnection(player);
+			playerConnection = MinecraftFields.getPlayerConnection(getPlayer());
 		}
 		return playerConnection;
 	}