* Fixed some possible null pointer exceptions.

Mage.Server.Plugins/Mage.Player.Human/src/mage/player/human/HumanPlayer.java

@@ -730,12 +730,15 @@ public class HumanPlayer extends PlayerImpl {
     }
 
     private boolean checkPassStep(Game game) {
+        if (game.getStep() != null) {
             if (playerId.equals(game.getActivePlayerId())) {
                 return !this.getUserData().getUserSkipPrioritySteps().getYourTurn().isPhaseStepSet(game.getStep().getType());
             } else {
                 return !this.getUserData().getUserSkipPrioritySteps().getOpponentTurn().isPhaseStepSet(game.getStep().getType());
             }
         }
+        return true;
+    }
 
     @Override
     public TriggeredAbility chooseTriggeredAbility(List<TriggeredAbility> abilities, Game game) {

Mage.Server/src/main/java/mage/server/TableController.java

@@ -567,7 +567,7 @@ public class TableController {
             String creator = null;
             StringBuilder opponent = new StringBuilder();
             for (Entry<UUID, UUID> entry : userPlayerMap.entrySet()) { // no AI players
-                if (!match.getPlayer(entry.getValue()).hasQuit()) {
+                if (match.getPlayer(entry.getValue()) != null && !match.getPlayer(entry.getValue()).hasQuit()) {
                     User user = UserManager.getInstance().getUser(entry.getKey());
                     if (user != null) {
                         user.ccGameStarted(match.getGame().getId(), entry.getValue());

Mage.Sets/src/mage/sets/kaladesh/BomatCourier.java

@@ -45,6 +45,7 @@ import mage.constants.ColoredManaSymbol;
 import mage.constants.Outcome;
 import mage.constants.Rarity;
 import mage.constants.Zone;
+import mage.game.ExileZone;
 import mage.game.Game;
 import mage.players.Player;
 import mage.util.CardUtil;
@@ -139,7 +140,11 @@ class BomatCourierReturnEffect extends OneShotEffect {
     public boolean apply(Game game, Ability source) {
         Player controller = game.getPlayer(source.getControllerId());
         if (controller != null) {
-            return controller.moveCards(game.getExile().getExileZone(CardUtil.getCardExileZoneId(game, source.getSourceId(), true)), Zone.HAND, source, game);
+            ExileZone exileZone = game.getExile().getExileZone(CardUtil.getCardExileZoneId(game, source.getSourceId(), true));
+            if (exileZone != null) {
+                controller.moveCards(exileZone, Zone.HAND, source, game);
+            }
+            return true;
         }
         return false;
     }

Mage.Sets/src/mage/sets/kaladesh/LostLegacy.java

@@ -81,7 +81,7 @@ class LostLegacyEffect extends SearchTargetGraveyardHandLibraryForCardNameAndExi
     public boolean apply(Game game, Ability source) {
         String cardName = (String) game.getState().getValue(source.getSourceId().toString() + NameACardEffect.INFO_KEY);
         Player targetPlayer = game.getPlayer(getTargetPointer().getFirst(game, source));
-        if (targetPlayer != null) {
+        if (targetPlayer != null && cardName != null && !cardName.isEmpty()) {
             FilterCard filter = new FilterCard();
             filter.add(new NamePredicate(cardName));
             int cardsInHandBefore = targetPlayer.getHand().count(filter, game);

Mage.Sets/src/mage/sets/mercadianmasques/FoodChain.java

@@ -118,20 +118,19 @@ class FoodChainManaEffect extends ManaEffect {
             ChoiceColor choice = new ChoiceColor();
             controller.choose(Outcome.PutManaInPool, choice, game);
             ObjectColor chosenColor = choice.getColor();
+            if (chosenColor == null) {
+                return false;
+            }
             Mana mana = null;
             if (chosenColor.isBlack()) {
                 mana = new FoodChainManaBuilder().setMana(Mana.BlackMana(manaCostExiled + 1), source, game).build();
-            }
+            } else if (chosenColor.isBlue()) {
-            else if (chosenColor.isBlue()) {
                 mana = new FoodChainManaBuilder().setMana(Mana.BlueMana(manaCostExiled + 1), source, game).build();
-            }
+            } else if (chosenColor.isRed()) {
-            else if (chosenColor.isRed()) {
                 mana = new FoodChainManaBuilder().setMana(Mana.RedMana(manaCostExiled + 1), source, game).build();
-            }
+            } else if (chosenColor.isGreen()) {
-            else if (chosenColor.isGreen()) {
                 mana = new FoodChainManaBuilder().setMana(Mana.GreenMana(manaCostExiled + 1), source, game).build();
-            }
+            } else if (chosenColor.isWhite()) {
-            else if (chosenColor.isWhite()) {
                 mana = new FoodChainManaBuilder().setMana(Mana.WhiteMana(manaCostExiled + 1), source, game).build();
             }
             if (mana != null) {

Mage/src/main/java/mage/players/PlayerImpl.java

@@ -996,6 +996,10 @@ public abstract class PlayerImpl implements Player, Serializable {
                 Zone fromZone = game.getState().getZone(card.getMainCard().getId());
                 card.cast(game, fromZone, ability, playerId);
                 Spell spell = game.getStack().getSpell(ability.getId());
+                if (spell == null) {
+                    logger.error("Got no spell from stack. ability: " + ability.getRule());
+                    return false;
+                }
                 // some effects set sourceId to cast without paying mana costs or other costs
                 if (ability.getSourceId().equals(getCastSourceIdWithAlternateMana())) {
                     Ability spellAbility = spell.getSpellAbility();