diff --git a/source/blender/geometry/intern/volume_grid_resample.cc b/source/blender/geometry/intern/volume_grid_resample.cc
index dbcb33026c0..fd92ebddb87 100644
--- a/source/blender/geometry/intern/volume_grid_resample.cc
+++ b/source/blender/geometry/intern/volume_grid_resample.cc
@@ -28,6 +28,11 @@ openvdb::FloatGrid &resample_sdf_grid_if_necessary(bke::VolumeGrid<float> &volum
 
   /* TODO: Using #doResampleToMatch when the transform is affine and non-scaled may be faster. */
   openvdb::tools::resampleToMatch<openvdb::tools::BoxSampler>(grid, *storage);
+  /* Ensure valid background value for level set grids, otherwise pruning will throw an exception.
+   */
+  if (storage->background() < 0.0f) {
+    storage->tree().root().setBackground(0.0f, true);
+  }
   openvdb::tools::pruneLevelSet(storage->tree());
 
   return *storage;