Address weird crash case

cockatrice/src/game/player/player.cpp

@@ -1693,7 +1693,7 @@ void Player::actCreatePredefinedToken()
 
 void Player::actCreateRelatedCard()
 {
-    CardItem *sourceCard = game->getActiveCard();
+    const CardItem *sourceCard = game->getActiveCard();
     if (!sourceCard) {
         return;
     }
@@ -1714,7 +1714,7 @@ void Player::actCreateRelatedCard()
 
 void Player::actCreateAllRelatedCards()
 {
-    CardItem *sourceCard = game->getActiveCard();
+    const CardItem *sourceCard = game->getActiveCard();
     if (!sourceCard) {
         return;
     }
@@ -3247,11 +3247,10 @@ void Player::actSetPT()
 
 void Player::actDrawArrow()
 {
-    if (!game->getActiveCard()) {
+    auto *card = game->getActiveCard();
-        return;
+    if (card) {
+        card->drawArrow(Qt::red);
     }
-
-    game->getActiveCard()->drawArrow(Qt::red);
 }
 
 void Player::actIncP()
@@ -3436,30 +3435,27 @@ void Player::actCardCounterTrigger()
 
 void Player::actPlay()
 {
-    if (!game->getActiveCard()) {
+    auto *card = game->getActiveCard();
-        return;
+    if (card) {
+        const bool cipt = card->getInfo() ? card->getInfo()->getCipt() : false;
+        playCard(card, false, cipt);
     }
-
-    bool cipt = game->getActiveCard()->getInfo() ? game->getActiveCard()->getInfo()->getCipt() : false;
-    playCard(game->getActiveCard(), false, cipt);
 }
 
-void Player::actHide()
+void Player::actHide() const
 {
-    if (!game->getActiveCard()) {
+    auto *card = game->getActiveCard();
-        return;
+    if (card) {
+        card->getZone()->removeCard(card);
     }
-
-    game->getActiveCard()->getZone()->removeCard(game->getActiveCard());
 }
 
 void Player::actPlayFacedown()
 {
-    if (!game->getActiveCard()) {
+    auto *card = game->getActiveCard();
-        return;
+    if (card) {
+        playCard(card, true, false);
     }
-
-    playCard(game->getActiveCard(), true, false);
 }
 
 void Player::actReveal(QAction *action)

cockatrice/src/game/player/player.h

@@ -222,7 +222,7 @@ private slots:
     void actFlowT();
     void actSetAnnotation();
     void actPlay();
-    void actHide();
+    void actHide() const;
     void actPlayFacedown();
     void actReveal(QAction *action);
     void refreshShortcuts();

cockatrice/src/game/zones/card_zone.cpp

@@ -130,8 +130,13 @@ void CardZone::mousePressEvent(QGraphicsSceneMouseEvent *event)
         event->ignore();
 }
 
-void CardZone::addCard(CardItem *card, bool reorganize, int x, int y)
+void CardZone::addCard(CardItem *card, const bool reorganize, const int x, const int y)
 {
+    if (!card) {
+        qDebug() << "CardZone::addCard() card is null(???)";
+        return;
+    }
+
     for (auto *view : views) {
         if ((x <= view->getCards().size()) || (view->getNumberCards() == -1)) {
             view->addCard(new CardItem(player, nullptr, card->getName(), card->getProviderId(), card->getId()),
@@ -153,7 +158,7 @@ CardItem *CardZone::getCard(int cardId, const QString &cardName)
     CardItem *c = cards.findCard(cardId);
     if (!c) {
         qDebug() << "CardZone::getCard: card id=" << cardId << "not found";
-        return 0;
+        return nullptr;
     }
     // If the card's id is -1, this zone is invisible,
     // so we need to give the card an id and a name as it comes out.
@@ -179,7 +184,7 @@ CardItem *CardZone::takeCard(int position, int cardId, bool /*canResize*/)
             position = 0;
     }
     if (position >= cards.size())
-        return 0;
+        return nullptr;
 
     CardItem *c = cards.takeAt(position);
 
@@ -196,6 +201,11 @@ CardItem *CardZone::takeCard(int position, int cardId, bool /*canResize*/)
 
 void CardZone::removeCard(CardItem *card)
 {
+    if (!card) {
+        qDebug() << "CardZone::removeCard: card is null(???)";
+        return;
+    }
+
     cards.removeOne(card);
     reorganizeCards();
     emit cardCountChanged();