diff --git a/src/DotRecast.Detour.Crowd/DtProximityGrid.cs b/src/DotRecast.Detour.Crowd/DtProximityGrid.cs
index e394982..f481497 100644
--- a/src/DotRecast.Detour.Crowd/DtProximityGrid.cs
+++ b/src/DotRecast.Detour.Crowd/DtProximityGrid.cs
@@ -80,6 +80,7 @@ namespace DotRecast.Detour.Crowd
                     if (!_items.TryGetValue(key, out var ids))
                     {
                         ids = _listPool.Get();
+                        ids.Clear();
                         _items.Add(key, ids);
                     }