diff --git a/tools/editor/npc_spawner.cpp b/tools/editor/npc_spawner.cpp
index 2f725def..a6573415 100644
--- a/tools/editor/npc_spawner.cpp
+++ b/tools/editor/npc_spawner.cpp
@@ -177,6 +177,12 @@ bool NpcSpawner::loadFromFile(const std::string& path) {
                 s.position = glm::vec3(js["position"][0].get<float>(),
                                        js["position"][1].get<float>(),
                                        js["position"][2].get<float>());
+                // Reject NaN/inf positions — they crash the M2 renderer's
+                // matrix math and produce invisible / chaos-shaped instances.
+                if (!std::isfinite(s.position.x) || !std::isfinite(s.position.y) ||
+                    !std::isfinite(s.position.z)) {
+                    s.position = glm::vec3(0.0f);
+                }
             }
 
             if (js.contains("patrol") && js["patrol"].is_array()) {
diff --git a/tools/editor/object_placer.cpp b/tools/editor/object_placer.cpp
index 25b92d60..3d29dfa4 100644
--- a/tools/editor/object_placer.cpp
+++ b/tools/editor/object_placer.cpp
@@ -301,11 +301,19 @@ bool ObjectPlacer::loadFromFile(const std::string& path) {
                 obj.position = glm::vec3(jo["pos"][0].get<float>(),
                                          jo["pos"][1].get<float>(),
                                          jo["pos"][2].get<float>());
+                if (!std::isfinite(obj.position.x) || !std::isfinite(obj.position.y) ||
+                    !std::isfinite(obj.position.z)) {
+                    obj.position = glm::vec3(0.0f);
+                }
             }
             if (jo.contains("rot") && jo["rot"].is_array() && jo["rot"].size() >= 3) {
                 obj.rotation = glm::vec3(jo["rot"][0].get<float>(),
                                          jo["rot"][1].get<float>(),
                                          jo["rot"][2].get<float>());
+                if (!std::isfinite(obj.rotation.x) || !std::isfinite(obj.rotation.y) ||
+                    !std::isfinite(obj.rotation.z)) {
+                    obj.rotation = glm::vec3(0.0f);
+                }
             }
 
             if (!obj.path.empty()) {