diff --git a/tools/editor/zone_manifest.cpp b/tools/editor/zone_manifest.cpp
index 2a1bbcea..afa420ca 100644
--- a/tools/editor/zone_manifest.cpp
+++ b/tools/editor/zone_manifest.cpp
@@ -5,6 +5,8 @@
 #include <filesystem>
 #include <chrono>
 #include <ctime>
+#include <cmath>
+#include <algorithm>
 
 namespace wowee {
 namespace editor {
@@ -85,6 +87,9 @@ bool ZoneManifest::load(const std::string& path) {
         description = j.value("description", "");
         mapId = j.value("mapId", 9000u);
         baseHeight = j.value("baseHeight", 100.0f);
+        // Sanitize edited values — baseHeight propagates into terrain mesh
+        // generation; volume into audio mixer.
+        if (!std::isfinite(baseHeight)) baseHeight = 100.0f;
         hasCreatures = j.value("hasCreatures", false);
 
         tiles.clear();
@@ -112,6 +117,12 @@ bool ZoneManifest::load(const std::string& path) {
             ambienceNight = a.value("ambienceNight", "");
             musicVolume = a.value("musicVolume", 0.7f);
             ambienceVolume = a.value("ambienceVolume", 0.5f);
+            // Clamp volumes to [0, 1] and reject NaN — mixer would otherwise
+            // produce silent or clipping output.
+            if (!std::isfinite(musicVolume)) musicVolume = 0.7f;
+            if (!std::isfinite(ambienceVolume)) ambienceVolume = 0.5f;
+            musicVolume = std::clamp(musicVolume, 0.0f, 1.0f);
+            ambienceVolume = std::clamp(ambienceVolume, 0.0f, 1.0f);
         }
 
         return !mapName.empty();