diff --git a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/MessagesComposeFragment.kt b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/MessagesComposeFragment.kt
index c9cf6457..33168916 100644
--- a/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/MessagesComposeFragment.kt
+++ b/app/src/main/java/pl/szczodrzynski/edziennik/ui/modules/messages/MessagesComposeFragment.kt
@@ -275,8 +275,10 @@ class MessagesComposeFragment : Fragment(), CoroutineScope {
                     return null
                 }
                 b.recipients.allChips.forEach {
-                    if (it.data == data)
+                    if (it.data == data) {
+                        Toast.makeText(activity, R.string.messages_compose_recipient_exists, Toast.LENGTH_SHORT).show()
                         return null
+                    }
                 }
                 val chipSpan = ChipSpan(context, data.fullName, BitmapDrawable(context.resources, data.image), data)
                 chipSpan.setIconBackgroundColor(Colors.stringToMaterialColor(data.fullName))
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index dff7939d..bbc1f228 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -1146,4 +1146,5 @@
     <string name="compose">Napisz</string>
     <string name="messages_reply">Odpowiedz</string>
     <string name="error_unknown_format">Kod błędu: %d (w %s)</string>
+    <string name="messages_compose_recipient_exists">Ten odbiorca został już wybrany</string>
 </resources>