* Fixed that a delayed sacrifice source effect could create a null pointer exception.

Mage.Tests/src/test/java/org/mage/test/cards/abilities/keywords/TransformTest.java

@@ -213,4 +213,36 @@ public class TransformTest extends CardTestPlayerBase {
         Assert.assertFalse("Has not to have sorcery card type", nightmare.getCardType().contains(CardType.SORCERY));
     }
 
+    /**
+     * When copy token of Lambholt Pacifist transforms with "its transform
+     * ability", I see below error. Then rollback.
+     *
+     * 701.25a Only permanents represented by double-faced cards can transform.
+     * (See rule 711, “Double-Faced Cards.”) If a spell or ability instructs a
+     * player to transform any permanent that isn‘t represented by a
+     * double-faced card, nothing happens.
+     */
+    @Test
+    public void testTransformCopy() {
+        addCard(Zone.BATTLEFIELD, playerA, "Forest", 2);
+        // Lambholt Pacifist can't attack unless you control a creature with power 4 or greater.
+        // At the beginning of each upkeep, if no spells were cast last turn, transform Lambholt Pacifist.
+        addCard(Zone.HAND, playerA, "Lambholt Pacifist"); // {1}{G}
+
+        addCard(Zone.BATTLEFIELD, playerB, "Island", 4);
+        // You may have Clone enter the battlefield as a copy of any creature on the battlefield.
+        addCard(Zone.HAND, playerB, "Clone"); // {3}{U}
+
+        castSpell(1, PhaseStep.PRECOMBAT_MAIN, playerA, "Lambholt Pacifist");
+
+        castSpell(2, PhaseStep.PRECOMBAT_MAIN, playerB, "Clone");
+        setChoice(playerB, "Lambholt Pacifist");
+
+        setStopAt(4, PhaseStep.PRECOMBAT_MAIN);
+        execute();
+
+        assertPermanentCount(playerA, "Lambholt Butcher", 1);
+
+        assertPermanentCount(playerB, "Lambholt Pacifist", 1);
+    }
 }

Mage.Tests/src/test/java/org/mage/test/cards/abilities/other/NecromancyTest.java

@@ -128,4 +128,27 @@ public class NecromancyTest extends CardTestPlayerBase {
         assertGraveyardCount(playerA, "Craw Wurm", 1);
     }
 
+    /**
+     * I was playing a legendary cube, flashed in a Necromancy to block and when
+     * the creature I reanimated died the game bugged out and I lost.
+     */
+    @Test
+    public void testBlockWithNecromancyCreature() {
+        addCard(Zone.BATTLEFIELD, playerB, "Silvercoat Lion");
+
+        addCard(Zone.BATTLEFIELD, playerA, "Swamp", 3);
+        addCard(Zone.HAND, playerA, "Necromancy"); // {2}{B}
+        addCard(Zone.GRAVEYARD, playerA, "Silvercoat Lion");
+
+        attack(2, playerB, "Silvercoat Lion");
+        castSpell(2, PhaseStep.DECLARE_ATTACKERS, playerA, "Necromancy"); // enchanting the Silvercoat Lion
+        block(2, playerA, "Silvercoat Lion", "Silvercoat Lion");
+
+        setStopAt(3, PhaseStep.END_TURN);
+        execute();
+
+        assertGraveyardCount(playerA, "Necromancy", 1);
+        assertGraveyardCount(playerA, "Silvercoat Lion", 1);
+        assertGraveyardCount(playerB, "Silvercoat Lion", 1);
+    }
 }

Mage/src/main/java/mage/abilities/effects/common/SacrificeSourceEffect.java

@@ -62,7 +62,7 @@ public class SacrificeSourceEffect extends OneShotEffect {
             // Check if the effect was installed by the spell the source was cast by (e.g. Necromancy), if not don't sacrifice the permanent
             if (source.getSourceObject(game) instanceof Spell) {
                 sourceObject = game.getPermanent(source.getSourceId());
-                if (sourceObject.getZoneChangeCounter(game) > source.getSourceObjectZoneChangeCounter() + 1) {
+                if (sourceObject != null && sourceObject.getZoneChangeCounter(game) > source.getSourceObjectZoneChangeCounter() + 1) {
                     return false;
                 }
             }