Fixed some following bugs.

src/main/java/net/nuggetmc/ai/utils/PlayerUtils.java

@@ -0,0 +1,10 @@
+package net.nuggetmc.ai.utils;
+
+import org.bukkit.GameMode;
+
+public class PlayerUtils {
+
+    public static boolean isVulnerableGamemode(GameMode mode) {
+        return mode == GameMode.SURVIVAL || mode == GameMode.ADVENTURE;
+    }
+}