diff --git a/Mage.Tests/src/test/java/org/mage/test/combat/AttackBlockRestrictionsTest.java b/Mage.Tests/src/test/java/org/mage/test/combat/AttackBlockRestrictionsTest.java
index e515286e02e..22db23e6fda 100644
--- a/Mage.Tests/src/test/java/org/mage/test/combat/AttackBlockRestrictionsTest.java
+++ b/Mage.Tests/src/test/java/org/mage/test/combat/AttackBlockRestrictionsTest.java
@@ -298,4 +298,33 @@ public class AttackBlockRestrictionsTest extends CardTestPlayerBase {
         assertPermanentCount(playerB, "Walking Corpse", 1);
         assertPermanentCount(playerB, "Llanowar Elves", 1);
     }
+
+    /**
+     * Reproduces a bug when a creature that must be blocked is not attacking
+     */
+    @Test
+    public void testTurntimberBasilisk() {
+        addCard(Zone.BATTLEFIELD, playerA, "Turntimber Basilisk");
+        addCard(Zone.BATTLEFIELD, playerA, "Grizzly Bears");
+        addCard(Zone.HAND, playerA, "Forest");
+
+        addCard(Zone.BATTLEFIELD, playerB, "Storm Crow");
+
+        playLand(3, PhaseStep.PRECOMBAT_MAIN, playerA, "Forest");
+        addTarget(playerA, "Storm Crow");
+
+        attack(3, playerA, "Grizzly Bears");
+        block(3, playerB, "Storm Crow", "Grizzly Bears");
+
+        setStopAt(3, PhaseStep.END_TURN);
+        execute();
+
+        assertLife(playerA, 20);
+        assertLife(playerB, 20);
+
+        assertPermanentCount(playerA, "Turntimber Basilisk", 1);
+        assertPermanentCount(playerA, "Grizzly Bears", 1);
+        assertPermanentCount(playerB, "Storm Crow", 0);
+    }
+
 }
diff --git a/Mage/src/mage/game/combat/Combat.java b/Mage/src/mage/game/combat/Combat.java
index 665d62b459d..7b041bdef57 100644
--- a/Mage/src/mage/game/combat/Combat.java
+++ b/Mage/src/mage/game/combat/Combat.java
@@ -538,6 +538,11 @@ public class Combat implements Serializable, Copyable<Combat> {
                         UUID attackingCreatureId = requirementEntry.getKey().mustBlockAttacker(ability, game);
                         Player defender = game.getPlayer(possibleBlocker.getControllerId());
                         if (attackingCreatureId != null && defender != null && possibleBlocker.canBlock(attackingCreatureId, game)) {
+                            Permanent attackingCreature = game.getPermanent(attackingCreatureId);
+                            if (attackingCreature == null || !attackingCreature.isAttacking()) {
+                                // creature that must be blocked is not attacking
+                                continue;
+                            }
                             // check if the possible blocker has to pay cost to block, if so don't force
                             if (game.getContinuousEffects().checkIfThereArePayCostToAttackBlockEffects(
                                     GameEvent.getEvent(GameEvent.EventType.DECLARE_BLOCKER, attackingCreatureId, possibleBlocker.getId(), possibleBlocker.getControllerId()), game)) {