diff --git a/app/src/main/java/eu/faircode/netguard/ActivityPro.java b/app/src/main/java/eu/faircode/netguard/ActivityPro.java
index 063d360d..817b3535 100644
--- a/app/src/main/java/eu/faircode/netguard/ActivityPro.java
+++ b/app/src/main/java/eu/faircode/netguard/ActivityPro.java
@@ -279,13 +279,18 @@ public class ActivityPro extends AppCompatActivity {
 
     @Override
     public boolean onPrepareOptionsMenu(Menu menu) {
-        if (IAB.isPurchased(SKU_DONATION, this) || Util.isPlayStoreInstall(this))
+        if (Util.isPlayStoreInstall(this))
             menu.removeItem(R.id.menu_challenge);
 
         return super.onPrepareOptionsMenu(menu);
     }
 
     private void menu_challenge() {
+        if (IAB.isPurchased(SKU_DONATION, this)) {
+            Toast.makeText(this, getString(R.string.title_pro_already), Toast.LENGTH_LONG).show();
+            return;
+        }
+
         LayoutInflater inflater = LayoutInflater.from(this);
         View view = inflater.inflate(R.layout.challenge, null, false);
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 0630a3f9..fd0819a3 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -325,6 +325,7 @@ Your internet traffic is not being sent to a remote VPN server.</string>
         A monthly subscriptions of 1 or 2 euros (excluding local taxes) will activate all pro features.
         You can cancel or manage a subscription via the subscriptions tab in the Play store app.
     </string>
+    <string name="title_pro_already">The pro features are already activated</string>
 
     <string-array name="themeNames">
         <item>teal/orange</item>