diff --git a/oeffi/res/values-de/strings.xml b/oeffi/res/values-de/strings.xml
index c1ed37c..b73e3ce 100644
--- a/oeffi/res/values-de/strings.xml
+++ b/oeffi/res/values-de/strings.xml
@@ -254,6 +254,7 @@
 
     <!-- directions trip details options -->
     <string name="directions_trip_details_action_calendar_title">Zum Kalender hinzufügen</string>
+    <string name="directions_trip_details_action_calendar_notfound">Es ist keine Kalender-App installiert</string>
     <string name="directions_trip_details_action_track_title">Ortung</string>
     <string name="directions_trip_details_action_share_title">Weiterleiten…</string>
     <string name="directions_trip_details_action_share_short_title">Kurznachricht weiterleiten…</string>
diff --git a/oeffi/res/values/strings.xml b/oeffi/res/values/strings.xml
index 6b0e9ff..58392f9 100644
--- a/oeffi/res/values/strings.xml
+++ b/oeffi/res/values/strings.xml
@@ -255,6 +255,7 @@
 
     <!-- directions trip details options -->
     <string name="directions_trip_details_action_calendar_title">Add to calendar</string>
+    <string name="directions_trip_details_action_calendar_notfound">There is no calendar app installed</string>
     <string name="directions_trip_details_action_track_title">Location tracking</string>
     <string name="directions_trip_details_action_share_title">Share…</string>
     <string name="directions_trip_details_action_share_short_title">Share short message…</string>
diff --git a/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java b/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
index 5ce1308..10b5f51 100644
--- a/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
+++ b/oeffi/src/de/schildbach/oeffi/directions/TripDetailsActivity.java
@@ -18,6 +18,7 @@
 package de.schildbach.oeffi.directions;
 
 import android.Manifest;
+import android.content.ActivityNotFoundException;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
@@ -257,10 +258,14 @@ public class TripDetailsActivity extends OeffiActivity implements LocationListen
                     });
                     popupMenu.show();
                 });
-        if (getPackageManager().resolveActivity(scheduleTripIntent, 0) != null) {
-            actionBar.addButton(R.drawable.ic_today_white_24dp, R.string.directions_trip_details_action_calendar_title)
-                    .setOnClickListener(v -> startActivity(scheduleTripIntent));
-        }
+        actionBar.addButton(R.drawable.ic_today_white_24dp, R.string.directions_trip_details_action_calendar_title)
+                .setOnClickListener(v -> {
+                    try {
+                        startActivity(scheduleTripIntent);
+                    } catch (final ActivityNotFoundException x) {
+                        new Toast(this).longToast(R.string.directions_trip_details_action_calendar_notfound);
+                    }
+                });
 
         legsGroup = findViewById(R.id.directions_trip_details_legs_group);