Added some exception handling.

Mage.Sets/src/mage/cards/h/HaphazardBombardment.java

@@ -131,10 +131,12 @@ class HaphazardBombardmentEndOfTurnEffect extends OneShotEffect {
         filter.add(new CounterPredicate(CounterType.AIM));
         filter.add(Predicates.not(new AbilityPredicate(IndestructibleAbility.class)));
         List<Permanent> permanents = game.getBattlefield().getActivePermanents(filter, source.getControllerId(), source.getSourceId(), game);
+        if (!permanents.isEmpty()) {
             Permanent permanent = permanents.get(RandomUtil.nextInt(permanents.size()));
             if (permanent != null) {
                 permanent.destroy(source.getSourceId(), game, false);
             }
+        }
         return true;
     }
 }

Mage.Sets/src/mage/cards/m/MetamorphicAlteration.java

@@ -1,5 +1,6 @@
 package mage.cards.m;
 
+import java.util.UUID;
 import mage.MageObject;
 import mage.abilities.Ability;
 import mage.abilities.common.AsEntersBattlefieldAbility;
@@ -18,8 +19,6 @@ import mage.target.Target;
 import mage.target.TargetPermanent;
 import mage.target.common.TargetCreaturePermanent;
 
-import java.util.UUID;
-
 /**
  *
  * @author noahg
@@ -81,9 +80,12 @@ class ChooseACreature extends OneShotEffect {
             if (target.canChoose(source.getSourceId(), controller.getId(), game)) {
                 controller.choose(Outcome.Copy, target, source.getSourceId(), game);
                 Permanent chosenPermanent = game.getPermanent(target.getFirstTarget());
+                if (chosenPermanent != null) {
                     game.getState().setValue(source.getSourceId().toString() + INFO_KEY, chosenPermanent.copy());
                 }
             }
+            return true;
+        }
         return false;
     }
 

Mage/src/main/java/mage/abilities/keyword/KickerAbility.java

@@ -1,7 +1,7 @@
-
 package mage.abilities.keyword;
 
 import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
 import mage.abilities.Ability;
 import mage.abilities.SpellAbility;
 import mage.abilities.StaticAbility;
@@ -52,7 +52,7 @@ public class KickerAbility extends StaticAbility implements OptionalAdditionalSo
     protected static final String KICKER_REMINDER_MANA = "You may pay an additional {cost} as you cast this spell.";
     protected static final String KICKER_REMINDER_COST = "You may {cost} in addition to any other costs as you cast this spell.";
 
-    protected Map<String, Integer> activations = new HashMap<>(); // zoneChangeCounter, activations
+    protected Map<String, Integer> activations = new ConcurrentHashMap<>(); // zoneChangeCounter, activations
 
     protected String keywordText;
     protected String reminderText;

Mage/src/main/java/mage/abilities/keyword/StormAbility.java

@@ -1,4 +1,3 @@
-
 package mage.abilities.keyword;
 
 import mage.MageObjectReference;
@@ -14,6 +13,7 @@ import mage.game.events.GameEvent.EventType;
 import mage.game.stack.Spell;
 import mage.game.stack.StackObject;
 import mage.watchers.common.CastSpellLastTurnWatcher;
+import org.apache.log4j.Logger;
 
 /**
  *
@@ -75,6 +75,7 @@ class StormEffect extends OneShotEffect {
         MageObjectReference spellRef = (MageObjectReference) this.getValue("StormSpellRef");
         if (spellRef != null) {
             CastSpellLastTurnWatcher watcher = (CastSpellLastTurnWatcher) game.getState().getWatchers().get(CastSpellLastTurnWatcher.class.getSimpleName());
+            if (watcher != null) {
                 int stormCount = watcher.getSpellOrder(spellRef, game) - 1;
                 if (stormCount > 0) {
                     Spell spell = (Spell) this.getValue("StormSpell");
@@ -87,6 +88,9 @@ class StormEffect extends OneShotEffect {
                         }
                     }
                 }
+            } else {
+                Logger.getLogger(StormEffect.class).fatal("CastSpellLastTurnWatcher not found. game = " + game == null ? "NULL" : game.getGameType().toString());
+            }
             return true;
         }
         return false;

Mage/src/main/java/mage/target/common/TargetSpellOrPermanent.java

@@ -248,6 +248,7 @@ public class TargetSpellOrPermanent extends TargetImpl {
                 sb.append(permanent.getLogName()).append(' ');
             } else {
                 Spell spell = game.getStack().getSpell(targetId);
+                if (spell != null) {
                     if (spell.isFaceDown(game)) {
                         sb.append(GameLog.getNeutralColoredText("face down spell"));
                     } else {
@@ -255,6 +256,7 @@ public class TargetSpellOrPermanent extends TargetImpl {
                     }
                 }
             }
+        }
         return sb.toString();
     }