diff --git a/src/main/java/world/bentobox/chunkblock/listeners/BossBarListener.java b/src/main/java/world/bentobox/chunkblock/listeners/BossBarListener.java
index 36fe748..9610f78 100644
--- a/src/main/java/world/bentobox/chunkblock/listeners/BossBarListener.java
+++ b/src/main/java/world/bentobox/chunkblock/listeners/BossBarListener.java
@@ -57,7 +57,7 @@ private boolean ready() {
 
     @EventHandler(priority = EventPriority.NORMAL, ignoreCancelled = true)
     public void onBreakBlockEvent(MagicBlockEvent e) {
-        if (!ready()) {
+        if (!ready() || e.getPlayerUUID() == null) {
             return;
         }
         // Update boss bar
diff --git a/src/test/java/world/bentobox/chunkblock/listeners/BossBarListenerTest.java b/src/test/java/world/bentobox/chunkblock/listeners/BossBarListenerTest.java
index 4bd49b7..e520e8c 100644
--- a/src/test/java/world/bentobox/chunkblock/listeners/BossBarListenerTest.java
+++ b/src/test/java/world/bentobox/chunkblock/listeners/BossBarListenerTest.java
@@ -249,4 +249,16 @@ void testBukkitToAdventureParsesHex() {
     void testBukkitToAdventureNullIsEmpty() {
         assertEquals(Component.empty(), BossBarListener.bukkitToAdventure(null));
     }
+
+    /**
+     * NPC/minion breaks fire MagicBlockEvent with a null playerUUID; the listener must not throw.
+     */
+    @Test
+    void testNullPlayerUUIDDoesNotThrow() {
+        when(island.isAllowed(addon.CHUNKBLOCK_BOSSBAR)).thenReturn(true);
+        when(island.isAllowed(addon.CHUNKBLOCK_ACTIONBAR)).thenReturn(true);
+        bbl.onBreakBlockEvent(new MagicBlockEvent(island, null, null, block, Material.STONE));
+        verify(mockPlayer, never()).sendActionBar(any(Component.class));
+        verify(bossBar, never()).addPlayer(any());
+    }
 }