diff --git a/stream-chat-android-client/api/stream-chat-android-client.api b/stream-chat-android-client/api/stream-chat-android-client.api
index 23e58981d58..d804dcf6f84 100644
--- a/stream-chat-android-client/api/stream-chat-android-client.api
+++ b/stream-chat-android-client/api/stream-chat-android-client.api
@@ -92,6 +92,7 @@ public final class io/getstream/chat/android/client/ChatClient {
 	public static final fun instance ()Lio/getstream/chat/android/client/ChatClient;
 	public final fun inviteMembers (Ljava/lang/String;Ljava/lang/String;Ljava/util/List;Lio/getstream/chat/android/models/Message;Ljava/lang/Boolean;)Lio/getstream/result/call/Call;
 	public static synthetic fun inviteMembers$default (Lio/getstream/chat/android/client/ChatClient;Ljava/lang/String;Ljava/lang/String;Ljava/util/List;Lio/getstream/chat/android/models/Message;Ljava/lang/Boolean;ILjava/lang/Object;)Lio/getstream/result/call/Call;
+	public static final fun isInitialized ()Z
 	public final fun isSocketConnected ()Z
 	public final fun keystroke (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Lio/getstream/result/call/Call;
 	public static synthetic fun keystroke$default (Lio/getstream/chat/android/client/ChatClient;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;ILjava/lang/Object;)Lio/getstream/result/call/Call;
diff --git a/stream-chat-android-client/src/main/java/io/getstream/chat/android/client/ChatClient.kt b/stream-chat-android-client/src/main/java/io/getstream/chat/android/client/ChatClient.kt
index ea5d6641bfe..cfd8230236a 100644
--- a/stream-chat-android-client/src/main/java/io/getstream/chat/android/client/ChatClient.kt
+++ b/stream-chat-android-client/src/main/java/io/getstream/chat/android/client/ChatClient.kt
@@ -3821,6 +3821,7 @@ internal constructor(
                 )
         }
 
+        @JvmStatic
         public val isInitialized: Boolean
             get() = instance != null
 
diff --git a/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.kt b/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.kt
index ee7e38f5005..23f94d35e5c 100644
--- a/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.kt
+++ b/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaGalleryPreviewActivity.kt
@@ -228,6 +228,11 @@ public class MediaGalleryPreviewActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
+
         uiState = savedInstanceState?.getParcelable(
             KeyMediaGalleryPreviewActivityState,
         ) ?: intent?.getParcelableExtra(KeyMediaGalleryPreviewActivityState)
diff --git a/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaPreviewActivity.kt b/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaPreviewActivity.kt
index dc0c666f3c6..57cd0346515 100644
--- a/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaPreviewActivity.kt
+++ b/stream-chat-android-compose/src/main/java/io/getstream/chat/android/compose/ui/attachments/preview/MediaPreviewActivity.kt
@@ -56,6 +56,7 @@ import androidx.compose.ui.text.style.TextAlign
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
 import androidx.core.view.isVisible
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.compose.R
 import io.getstream.chat.android.compose.ui.theme.ChatTheme
 import io.getstream.chat.android.compose.ui.util.mirrorRtl
@@ -71,7 +72,7 @@ public class MediaPreviewActivity : AppCompatActivity() {
         val url = intent.getStringExtra(KEY_URL)
         val title = intent.getStringExtra(KEY_TITLE) ?: ""
 
-        if (url.isNullOrEmpty()) {
+        if (url.isNullOrEmpty() || ChatClient.isInitialized.not()) {
             finish()
             return
         }
diff --git a/stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/feature/documents/AttachmentDocumentActivity.java b/stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/feature/documents/AttachmentDocumentActivity.java
index 568a0d8c9f1..97317842a5a 100644
--- a/stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/feature/documents/AttachmentDocumentActivity.java
+++ b/stream-chat-android-ui-common/src/main/kotlin/io/getstream/chat/android/ui/common/feature/documents/AttachmentDocumentActivity.java
@@ -47,6 +47,11 @@ public class AttachmentDocumentActivity extends AppCompatActivity {
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        if (!ChatClient.isInitialized()) {
+            finish();
+            return;
+        }
+
         setContentView(R.layout.stream_activity_attachment_document);
         rootView = findViewById(R.id.rootView);
         webView = findViewById(R.id.webView);
diff --git a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/channels/ChannelListActivity.kt b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/channels/ChannelListActivity.kt
index db6d269d329..1bf45413d5c 100644
--- a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/channels/ChannelListActivity.kt
+++ b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/channels/ChannelListActivity.kt
@@ -23,6 +23,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.updatePadding
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.ui.R
 import io.getstream.chat.android.ui.databinding.StreamUiFragmentContainerBinding
 
@@ -35,6 +36,11 @@ public open class ChannelListActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
         binding = StreamUiFragmentContainerBinding.inflate(layoutInflater)
         setContentView(binding.root)
         setupEdgeToEdge()
diff --git a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentActivity.kt b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentActivity.kt
index b77ad9c0f54..f30dbcf6efb 100644
--- a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentActivity.kt
+++ b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentActivity.kt
@@ -28,6 +28,7 @@ import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.models.AttachmentType
 import io.getstream.chat.android.ui.R
 import io.getstream.chat.android.ui.databinding.StreamUiActivityAttachmentBinding
@@ -46,6 +47,11 @@ public class AttachmentActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
+
         binding = StreamUiActivityAttachmentBinding.inflate(streamThemeInflater)
         setContentView(binding.root)
 
diff --git a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentGalleryActivity.kt b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentGalleryActivity.kt
index 7086febbc13..65b211d9f24 100644
--- a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentGalleryActivity.kt
+++ b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentGalleryActivity.kt
@@ -34,6 +34,7 @@ import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
 import androidx.lifecycle.lifecycleScope
 import androidx.viewpager2.widget.ViewPager2
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.core.internal.coroutines.DispatcherProvider
 import io.getstream.chat.android.models.Attachment
 import io.getstream.chat.android.models.AttachmentType
@@ -117,6 +118,11 @@ public class AttachmentGalleryActivity : AppCompatActivity() {
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
+
         binding = StreamUiActivityAttachmentGalleryBinding.inflate(streamThemeInflater)
         setContentView(binding.root)
         setupEdgeToEdge()
diff --git a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentMediaActivity.kt b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentMediaActivity.kt
index 93e74e4d5e8..d4328658c62 100644
--- a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentMediaActivity.kt
+++ b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/gallery/AttachmentMediaActivity.kt
@@ -31,6 +31,7 @@ import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.isVisible
 import androidx.core.view.updatePadding
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.ui.R
 import io.getstream.chat.android.ui.databinding.StreamUiActivityAttachmentMediaBinding
 import io.getstream.chat.android.ui.utils.extensions.getColorCompat
@@ -52,6 +53,12 @@ public class AttachmentMediaActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
+
         binding = StreamUiActivityAttachmentMediaBinding.inflate(streamThemeInflater)
         setContentView(binding.root)
 
diff --git a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/MessageListActivity.kt b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/MessageListActivity.kt
index 66cf9b5394b..9811dda679b 100644
--- a/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/MessageListActivity.kt
+++ b/stream-chat-android-ui-components/src/main/kotlin/io/getstream/chat/android/ui/feature/messages/MessageListActivity.kt
@@ -23,6 +23,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import androidx.core.view.updatePadding
+import io.getstream.chat.android.client.ChatClient
 import io.getstream.chat.android.ui.R
 import io.getstream.chat.android.ui.databinding.StreamUiFragmentContainerBinding
 
@@ -35,6 +36,11 @@ public open class MessageListActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        if (ChatClient.isInitialized.not()) {
+            finish()
+            return
+        }
         binding = StreamUiFragmentContainerBinding.inflate(layoutInflater)
         setContentView(binding.root)
         setupEdgeToEdge()