null check

src/engine/objects/Mob.java

@@ -1706,12 +1706,16 @@ public class Mob extends AbstractIntelligenceAgent {
 
         this.deathTime = 0;
         if(PowersManager._allRuneSkillAdjusts.containsKey(this.getMobBaseID()))
-            for(RuneSkillAdjustEntry entry : PowersManager._allRuneSkillAdjusts.get(this.getMobBaseID()))
-                if(entry.level <= this.level)
-                    if(this.skills.containsKey(entry.name) == false)
-                        this.skills.put(entry.skill_type,new CharacterSkill(SkillsBase.getFromCache(entry.token),this,entry.rank));
-                     else
-                        this.skills.put(entry.skill_type,new CharacterSkill(SkillsBase.getFromCache(entry.token),this,entry.rank + this.skills.get(entry.skill_type).getNumTrains()));
+            for(RuneSkillAdjustEntry entry : PowersManager._allRuneSkillAdjusts.get(this.getMobBaseID())) {
+                SkillsBase skillBase = SkillsBase.getFromCache(entry.token);
+                if(skillBase == null)
+                    continue;
+                if (entry.level <= this.level)
+                    if (this.skills.containsKey(entry.name) == false)
+                        this.skills.put(entry.skill_type, new CharacterSkill(skillBase, this, entry.rank));
+                    else
+                        this.skills.put(entry.skill_type, new CharacterSkill(skillBase, this, entry.rank + this.skills.get(entry.skill_type).getNumTrains()));
+            }
     }
 
     @Override