diff --git a/src/ChannelManagers/LocalChannelManager.php b/src/ChannelManagers/LocalChannelManager.php
index c29f7ff..5d33f83 100644
--- a/src/ChannelManagers/LocalChannelManager.php
+++ b/src/ChannelManagers/LocalChannelManager.php
@@ -323,7 +323,7 @@ class LocalChannelManager implements ChannelManager
 
         $members = collect($members)->map(function ($user) {
             return json_decode($user);
-        })->unique('id')->toArray();
+        })->unique('user_id')->toArray();
 
         return new FulfilledPromise($members);
     }
diff --git a/src/ChannelManagers/RedisChannelManager.php b/src/ChannelManagers/RedisChannelManager.php
index f914b2c..9b71d9a 100644
--- a/src/ChannelManagers/RedisChannelManager.php
+++ b/src/ChannelManagers/RedisChannelManager.php
@@ -350,7 +350,7 @@ class RedisChannelManager extends LocalChannelManager
                     ->map(function ($user) {
                         return json_decode($user);
                     })
-                    ->unique('id')
+                    ->unique('user_id')
                     ->toArray();
             });
     }
diff --git a/tests/PresenceChannelTest.php b/tests/PresenceChannelTest.php
index 755f895..55ad3d1 100644
--- a/tests/PresenceChannelTest.php
+++ b/tests/PresenceChannelTest.php
@@ -73,6 +73,41 @@ class PresenceChannelTest extends TestCase
             ]);
         }
 
+        $rick->assertSentEvent('pusher_internal:subscription_succeeded', [
+            'channel' => 'presence-channel',
+            'data' => json_encode([
+                'presence' => [
+                    'ids' => ['1'],
+                    'hash' => ['1' => []],
+                    'count' => 1,
+                ],
+            ]),
+        ]);
+
+        $morty->assertSentEvent('pusher_internal:subscription_succeeded', [
+            'channel' => 'presence-channel',
+            'data' => json_encode([
+                'presence' => [
+                    'ids' => ['1', '2'],
+                    'hash' => ['1' => [], '2' => []],
+                    'count' => 2,
+                ],
+            ]),
+        ]);
+
+        // The duplicated-user_id connection should get basically the list of ids
+        // without dealing with duplicate user ids.
+        $pickleRick->assertSentEvent('pusher_internal:subscription_succeeded', [
+            'channel' => 'presence-channel',
+            'data' => json_encode([
+                'presence' => [
+                    'ids' => ['1', '2'],
+                    'hash' => ['1' => [], '2' => []],
+                    'count' => 2,
+                ],
+            ]),
+        ]);
+
         $this->channelManager
             ->getGlobalConnectionsCount('1234', 'presence-channel')
             ->then(function ($total) {