diff --git a/ext/dash/gstmpdparser.c b/ext/dash/gstmpdparser.c
index ea5dc6bb14..c604c458cf 100644
--- a/ext/dash/gstmpdparser.c
+++ b/ext/dash/gstmpdparser.c
@@ -4563,9 +4563,14 @@ gst_mpd_client_get_next_segment_availability_end_time (GstMpdClient * client,
   if (stream_period && stream_period->period) {
     GstDateTime *t =
         gst_mpd_client_add_time_difference (availability_start_time,
-        stream_period->start * 1000);
+        stream_period->start / 1000);
     gst_date_time_unref (availability_start_time);
     availability_start_time = t;
+
+    if (availability_start_time == NULL) {
+      GST_WARNING_OBJECT (client, "Failed to offset availability_start_time");
+      return NULL;
+    }
   }
 
   offset = (1 + seg_idx) * seg_duration;