1 files changed, 6 insertions, 1 deletions
diff --git a/src/displayapp/screens/WatchFaceDigital.cpp b/src/displayapp/screens/WatchFaceDigital.cpp
index fa81418..76283e2 100644
--- a/src/displayapp/screens/WatchFaceDigital.cpp
+++ b/src/displayapp/screens/WatchFaceDigital.cpp
@@ -262,7 +262,12 @@ void WatchFaceDigital::Refresh() {
   if (heartbeat.IsUpdated() || heartbeatRunning.IsUpdated()) {
     if (heartbeatRunning.Get()) {
       lv_obj_set_style_local_text_color(heartbeatIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0xCE1B1B));
-      lv_label_set_text_fmt(heartbeatValue, "%d", heartbeat.Get());
+      auto v = heartbeat.Get();
+      if (v) {
+        lv_label_set_text_fmt(heartbeatValue, "%d", v);
+      } else {
+        lv_label_set_text_static(heartbeatValue, "");
+      }
     } else {
       lv_obj_set_style_local_text_color(heartbeatIcon, LV_LABEL_PART_MAIN, LV_STATE_DEFAULT, lv_color_hex(0x1B1B1B));
       lv_label_set_text_static(heartbeatValue, "");