diff --git a/WebHostLib/api/tracker.py b/WebHostLib/api/tracker.py
index abf4cdbe..4ea3a233 100644
--- a/WebHostLib/api/tracker.py
+++ b/WebHostLib/api/tracker.py
@@ -112,7 +112,9 @@ def tracker_data(tracker: UUID) -> dict[str, Any]:
     client_activity_timers: tuple[tuple[int, int], float] = tracker_data._multisave.get("client_activity_timers", ())
     for (team, player), timestamp in client_activity_timers:
         # use index since we can rely on order
-        activity_timers[team]["player_timers"][player - 1]["time"] = datetime.fromtimestamp(timestamp, timezone.utc)
+        # FIX: key is "players" (not "player_timers")
+        activity_timers[team]["players"][player - 1]["time"] = datetime.fromtimestamp(timestamp, timezone.utc)
+
 
     connection_timers: list[dict[str, int | list[PlayerTimer]]] = []
     """Time of last connection per player. Returned as RFC 1123 format and null if no connection has been made."""