fixed bugs, memory leaks, etc

src/main/java/dev/zprestige/prestige/module/misc/KeyPearl.java

@@ -34,7 +34,7 @@ public class KeyPearl extends Module {
 
     @Subscribe
     public void onClientTick(ClientTickEvent event) {
-        if (mc.currentScreen == null && mc.isWindowFocused()) {
+        if (mc.player != null && mc.currentScreen == null && mc.isWindowFocused()) {
             if (this.actionTimer.hasElapsed(this.delay.getValue())) {
                 if (this.pearlThrown) {
                     InventoryUtil.selectSlot(this.previousSlot);