diff --git a/app/src/main/java/com/github/gotify/sharing/ShareActivity.java b/app/src/main/java/com/github/gotify/sharing/ShareActivity.java
index dcd2994..14d9e7a 100644
--- a/app/src/main/java/com/github/gotify/sharing/ShareActivity.java
+++ b/app/src/main/java/com/github/gotify/sharing/ShareActivity.java
@@ -78,6 +78,13 @@ public class ShareActivity extends AppCompatActivity {
             }
         }
 
+        if (!settings.tokenExists()) {
+            Toast.makeText(getApplicationContext(), R.string.not_loggedin_share, Toast.LENGTH_SHORT)
+                    .show();
+            finish();
+            return;
+        }
+
         ApiClient client =
                 ClientFactory.clientToken(settings.url(), settings.sslSettings(), settings.token());
         appsHolder = new ApplicationHolder(this, client);
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 4fea115..cfa850c 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -83,4 +83,5 @@
     <string name="push_priority_hint">Priority</string>
     <string name="push_missing_app_info">There are no applications available on the server to push a message to.</string>
     <string name="message_copied_to_clipboard">Content copied to clipboard</string>
+    <string name="not_loggedin_share">Cannot share to Gotify, because you aren\'t logged in.</string>
 </resources>