Fixed a NPE that could occur if Roll was disabled in coreskills.yml

Changelog.txt

@@ -1,5 +1,6 @@
 Version 2.1.72
     Fixed a NPE if a server shutdown with no player data needing to be saved (the error is harmless but spammy)
+    Fixed a NPE that could occur if Roll was disabled in coreskills.yml
 
 Version 2.1.71
     Salvage will now always ask for confirmation before breaking your items (instead of only asking for enchanted items)

src/main/java/com/gmail/nossr50/listeners/InteractionManager.java

@@ -15,12 +15,7 @@ public class InteractionManager {
     private static HashMap<String, AbstractSubSkill> subSkillNameMap; //Used for mmoinfo optimization
     private static ArrayList<AbstractSubSkill> subSkillList;
 
-    /**
-     * Registers subskills with the Interaction registration
-     * @param abstractSubSkill the target subskill to register
-     */
-    public static void registerSubSkill(AbstractSubSkill abstractSubSkill)
-    {
+    public static void initMaps() {
         /* INIT MAPS */
         if(interactRegister == null)
             interactRegister = new HashMap<>();
@@ -30,7 +25,14 @@ public class InteractionManager {
 
         if(subSkillNameMap == null)
             subSkillNameMap = new HashMap<>();
+    }
 
+    /**
+     * Registers subskills with the Interaction registration
+     * @param abstractSubSkill the target subskill to register
+     */
+    public static void registerSubSkill(AbstractSubSkill abstractSubSkill)
+    {
         //Store a unique copy of each subskill
         if(!subSkillList.contains(abstractSubSkill))
             subSkillList.add(abstractSubSkill);

src/main/java/com/gmail/nossr50/mcMMO.java

@@ -216,6 +216,8 @@ public class mcMMO extends JavaPlugin {
                     Permissions.generateWorldTeleportPermissions();
                 }
 
+                InteractionManager.initMaps(); //Init maps before populating ranks
+
                 //Populate Ranked Skill Maps (DO THIS LAST)
                 RankUtils.populateRanks();
             }