src/world: add z level range check

1 files changed, 1 insertions, 0 deletions

diff --git a/src/world.cpp b/src/world.cpp
index 56a0b735..4e8e0095 100644
--- a/src/world.cpp
+++ b/src/world.cpp
@@ -81,6 +81,7 @@ world::world(size_t capacity) : _chunks{capacity}
 
 chunk& world::operator[](chunk_coords_ coord) noexcept
 {
+    fm_debug_assert(coord.z >= -8 && coord.z < 8);
     auto& [c, coord2] = _last_chunk;
     if (coord != coord2)
         c = &_chunks.try_emplace(coord, *this).first->second;