Don't throw a NullPointerException if the injection fails.

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

@@ -78,11 +78,14 @@ class NetLoginInjector {
 			// This is the case if we're dealing with a connection initiated by the injected server socket
 			if (socketInjector != null) {
 				PlayerInjector injector = injectionHandler.injectPlayer(socketInjector.getPlayer(), inserting, GamePhase.LOGIN);
+				
+				if (injector != null) {
 					injector.updateOnLogin = true;
 		
 					// Save the login
 					injectedLogins.putIfAbsent(inserting, injector);
 				}
+			}
 			
 			// NetServerInjector can never work (currently), so we don't need to replace the NetLoginHandler
 			return inserting;	
@@ -90,7 +93,7 @@ class NetLoginInjector {
 		} catch (Throwable e) {
 			// Minecraft can't handle this, so we'll deal with it here
 			reporter.reportDetailed(this, "Unable to hook " + 
-						MinecraftReflection.getNetLoginHandlerName() + ".", e, inserting);
+						MinecraftReflection.getNetLoginHandlerName() + ".", e, inserting, injectionHandler);
 			return inserting;
 		}
 	}

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

@@ -269,6 +269,13 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 	 * @return The resulting player injector, or NULL if the injection failed.
 	 */
 	PlayerInjector injectPlayer(Player player, Object injectionPoint, GamePhase phase) {
+		if (player == null)
+			throw new IllegalArgumentException("Player cannot be NULL.");
+		if (injectionPoint == null)
+			throw new IllegalArgumentException("injectionPoint cannot be NULL.");
+		if (phase == null)
+			throw new IllegalArgumentException("phase cannot be NULL.");
+		
 		// Unfortunately, due to NetLoginHandler, multiple threads may potentially call this method.
 		synchronized (player) {
 			return injectPlayerInternal(player, injectionPoint, phase);
@@ -288,7 +295,7 @@ class ProxyPlayerInjectionHandler implements PlayerInjectionHandler {
 		boolean invalidInjector = injector != null ? !injector.canInject(phase) : true;
 
 		// Don't inject if the class has closed
-		if (!hasClosed && player != null && (tempHook != getInjectorType(injector) || invalidInjector)) {
+		if (!hasClosed && (tempHook != getInjectorType(injector) || invalidInjector)) {
 			while (tempHook != PlayerInjectHooks.NONE) {
 				// Whether or not the current hook method failed completely
 				boolean hookFailed = false;