diff --git a/app/src/main/java/de/danoeh/antennapod/dialog/SleepTimerDialog.java b/app/src/main/java/de/danoeh/antennapod/dialog/SleepTimerDialog.java
index fa5c2d8c3..691bd65e8 100644
--- a/app/src/main/java/de/danoeh/antennapod/dialog/SleepTimerDialog.java
+++ b/app/src/main/java/de/danoeh/antennapod/dialog/SleepTimerDialog.java
@@ -153,10 +153,13 @@ public class SleepTimerDialog extends DialogFragment {
                 return;
             }
             try {
+                long time = Long.parseLong(etxtTime.getText().toString());
+                if (time == 0) {
+                    throw new NumberFormatException("Timer must not be zero");
+                }
                 SleepTimerPreferences.setLastTimer(etxtTime.getText().toString(), spTimeUnit.getSelectedItemPosition());
-                long time = SleepTimerPreferences.timerMillis();
                 if (controller != null) {
-                    controller.setSleepTimer(time);
+                    controller.setSleepTimer(SleepTimerPreferences.timerMillis());
                 }
                 closeKeyboard(content);
             } catch (NumberFormatException e) {