diff --git a/src/main/java/org/mobarena/stats/session/SessionListener.java b/src/main/java/org/mobarena/stats/session/SessionListener.java
index 9e3a366..f76698d 100644
--- a/src/main/java/org/mobarena/stats/session/SessionListener.java
+++ b/src/main/java/org/mobarena/stats/session/SessionListener.java
@@ -88,6 +88,10 @@ public class SessionListener implements Listener {
         Arena arena = event.getArena();
         Player player = event.getPlayer();
 
+        if (arena.inSpec(player)) {
+            return;
+        }
+
         Session session = sessionStore.getByArena(arena);
         if (session == null) {
             log.warning("Unexpected leave event for non-existent session of arena " + arena.getSlug());
diff --git a/src/test/java/org/mobarena/stats/session/SessionListenerTest.java b/src/test/java/org/mobarena/stats/session/SessionListenerTest.java
index c87f013..78ed6ef 100644
--- a/src/test/java/org/mobarena/stats/session/SessionListenerTest.java
+++ b/src/test/java/org/mobarena/stats/session/SessionListenerTest.java
@@ -110,10 +110,23 @@ class SessionListenerTest {
         verify(session).playerReady(player, className);
     }
 
+    @Test
+    void ignoresPlayerLeaveForSpectators() {
+        Player player = mock(Player.class);
+        Arena arena = mock(Arena.class);
+        when(arena.inSpec(player)).thenReturn(true);
+        ArenaPlayerLeaveEvent event = new ArenaPlayerLeaveEvent(player, arena);
+
+        subject.on(event);
+
+        verifyNoInteractions(sessionStore);
+    }
+
     @Test
     void logsWarningIfPlayerLeavesInNonExistentSession() {
         Player player = mock(Player.class);
         Arena arena = mock(Arena.class);
+        when(arena.inSpec(player)).thenReturn(false);
         when(sessionStore.getByArena(arena)).thenReturn(null);
         ArenaPlayerLeaveEvent event = new ArenaPlayerLeaveEvent(player, arena);
 
@@ -127,6 +140,7 @@ class SessionListenerTest {
         Player player = mock(Player.class);
         Arena arena = mock(Arena.class);
         Session session = mock(Session.class);
+        when(arena.inSpec(player)).thenReturn(false);
         when(arena.isRunning()).thenReturn(false);
         when(arena.getPlayersInLobby()).thenReturn(Collections.singleton(player));
         when(sessionStore.getByArena(arena)).thenReturn(session);
@@ -142,6 +156,7 @@ class SessionListenerTest {
         Player player = mock(Player.class);
         Arena arena = mock(Arena.class);
         Session session = mock(Session.class);
+        when(arena.inSpec(player)).thenReturn(false);
         when(arena.isRunning()).thenReturn(false);
         when(arena.getPlayersInLobby()).thenReturn(Collections.singleton(player));
         when(sessionStore.getByArena(arena)).thenReturn(session);
@@ -158,6 +173,7 @@ class SessionListenerTest {
         Player other = mock(Player.class);
         Arena arena = mock(Arena.class);
         Session session = mock(Session.class);
+        when(arena.inSpec(player)).thenReturn(false);
         when(arena.isRunning()).thenReturn(false);
         when(arena.getPlayersInLobby()).thenReturn(new HashSet<>(Arrays.asList(player, other)));
         when(sessionStore.getByArena(arena)).thenReturn(session);
@@ -173,6 +189,7 @@ class SessionListenerTest {
         Player player = mock(Player.class);
         Arena arena = mock(Arena.class);
         Session session = mock(Session.class);
+        when(arena.inSpec(player)).thenReturn(false);
         when(arena.isRunning()).thenReturn(true);
         when(sessionStore.getByArena(arena)).thenReturn(session);
         ArenaPlayerLeaveEvent event = new ArenaPlayerLeaveEvent(player, arena);