diff --git a/IceCubesApp/App/Tabs/Timeline/AddRemoteTimelineView.swift b/IceCubesApp/App/Tabs/Timeline/AddRemoteTimelineView.swift
index 3f6e7e38..ef1a9429 100644
--- a/IceCubesApp/App/Tabs/Timeline/AddRemoteTimelineView.swift
+++ b/IceCubesApp/App/Tabs/Timeline/AddRemoteTimelineView.swift
@@ -37,6 +37,11 @@ struct AddRemoteTimelineView: View {
             .foregroundColor(.green)
             .listRowBackground(theme.primaryBackgroundColor)
         }
+        if !instanceName.isEmpty && instance == nil {
+          Label("timeline.\(instanceName)-not-valid", systemImage: "xmark.seal.fill")
+            .foregroundColor(.red)
+            .listRowBackground(theme.primaryBackgroundColor)
+        }
         Button {
           guard instance != nil else { return }
           context.insert(LocalTimeline(instance: instanceName))
@@ -45,6 +50,7 @@ struct AddRemoteTimelineView: View {
           Text("timeline.add.action.add")
         }
         .listRowBackground(theme.primaryBackgroundColor)
+        .disabled(instance == nil)
 
         instancesListView
       }
diff --git a/IceCubesApp/Resources/Localization/Localizable.xcstrings b/IceCubesApp/Resources/Localization/Localizable.xcstrings
index 552b1d8d..f256986d 100644
--- a/IceCubesApp/Resources/Localization/Localizable.xcstrings
+++ b/IceCubesApp/Resources/Localization/Localizable.xcstrings
@@ -701,6 +701,17 @@
         }
       }
     },
+    "%@ ist keine valide Instanz" : {
+      "extractionState" : "stale",
+      "localizations" : {
+        "uk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ не є дійсним екземпляром"
+          }
+        }
+      }
+    },
     "%@ was posted on Mastodon" : {
       "localizations" : {
         "de" : {
@@ -78831,6 +78842,125 @@
         }
       }
     },
+    "timeline.%@-not-valid" : {
+      "extractionState" : "manual",
+      "localizations" : {
+        "be" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ не з'яўляецца сапраўдным прыкладам"
+          }
+        },
+        "ca" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ no és una instància vàlida"
+          }
+        },
+        "de" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ ist keine gültige Instanz"
+          }
+        },
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ is not a valid instance"
+          }
+        },
+        "en-GB" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ is not a valid instance"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ no es una instancia válida"
+          }
+        },
+        "eu" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ ez da baliozko instantzia"
+          }
+        },
+        "fr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ n'est pas une instance valide"
+          }
+        },
+        "it" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ non è un'istanza valida"
+          }
+        },
+        "ja" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ 有効なインスタンスではありません"
+          }
+        },
+        "ko" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ 유효한 인스턴스가 아닙니다"
+          }
+        },
+        "nb" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ er ikke en gyldig instans"
+          }
+        },
+        "nl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ is geen geldige instantie"
+          }
+        },
+        "pl" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ nie jest poprawnym serwerem"
+          }
+        },
+        "pt-BR" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ não é uma instância válida"
+          }
+        },
+        "tr" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ geçerli bir örnek değil"
+          }
+        },
+        "uk" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ немає коректний сервера"
+          }
+        },
+        "zh-Hans" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ 不是一个有效的实例"
+          }
+        },
+        "zh-Hant" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "%@ 不是一個有效的實例"
+          }
+        }
+      }
+    },
     "timeline.add-remote.title" : {
       "localizations" : {
         "be" : {