diff --git a/tconnectsync/parser/nightscout.py b/tconnectsync/parser/nightscout.py
index 1427e1b..94aefd7 100644
--- a/tconnectsync/parser/nightscout.py
+++ b/tconnectsync/parser/nightscout.py
@@ -114,8 +114,8 @@ def activity(created_at, duration, reason="", event_type=ACTIVITY_EVENTTYPE):
     @staticmethod
     def profile_store(profile: Profile, device_settings: DeviceSettings) -> dict:
         return {
-            # insulin duration in hours
-            "dia": (profile.insulin_duration_min / 60),
+            # insulin duration in hours; Nightscout JS bug requires all top-level fields to be strings
+            "dia": "%s" % (profile.insulin_duration_min / 60),
             "carbratio": [
                 {
                     "time": tandem_to_ns_time(segment.time),
diff --git a/tconnectsync/sync/profile.py b/tconnectsync/sync/profile.py
index a4a9fbb..c187b16 100644
--- a/tconnectsync/sync/profile.py
+++ b/tconnectsync/sync/profile.py
@@ -88,6 +88,10 @@ def compare_profiles(device_profiles: List[Profile], device_settings: DeviceSett
         if profile.active:
             current_pump_profile = profile.title
 
+    if not current_pump_profile:
+        logger.error('No current pump profile, so skipping profile update: device: %s', device_profiles)
+        return False, current_ns_profile
+
     current_ns_profile = ns_profile_obj.get('defaultProfile')
     if current_pump_profile != current_ns_profile:
         logger.info("Current profile changed: pump: %s nightscout: %s", current_pump_profile, current_ns_profile)