diff --git a/server/gameserver/entity.h b/server/gameserver/entity.h
index caf9616..0171299 100644
--- a/server/gameserver/entity.h
+++ b/server/gameserver/entity.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include "gridservice.h"
+#include "room.h"
 
 namespace cs
 {
@@ -49,6 +50,15 @@ class Entity
     a8::Vec2 GetPos() { return pos_; };
     void SetPos(a8::Vec2 pos)
     {
+        #if 0
+        if (room && entity_subtype == EST_Player) {
+            if (room->frame_no > SERVER_FRAME_RATE * 35) {
+                if (pos.Distance(pos_) > 500) {
+                    abort();
+                }
+            }
+        }
+        #endif
         pos_ = pos;
     }
     float GetX()
diff --git a/server/gameserver/human.cc b/server/gameserver/human.cc
index fa3c635..f6ad548 100644
--- a/server/gameserver/human.cc
+++ b/server/gameserver/human.cc
@@ -427,6 +427,7 @@ void Human::RecalcSelfCollider()
 
 bool Human::IsCollisionInMapService()
 {
+    Global::last_collider = nullptr;
     if (room->OverBorder(GetPos(), meta->i->radius())){
         return true;
     }
@@ -438,7 +439,6 @@ bool Human::IsCollisionInMapService()
     std::set<ColliderComponent*> colliders;
     room->map_service.GetColliders(GetX(), GetY(), colliders);
 
-    Global::last_collider = nullptr;
     for (ColliderComponent* collider : colliders) {
         switch (collider->owner->entity_type) {
         case ET_Obstacle: