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GeoModelCore/GeoModelKernel/GeoModelKernel/GeoLogVol.h

@@ -35,6 +35,7 @@ class GeoLogVol : public RCBase
   
   //	Returns the material of the logical volume.
   const GeoMaterial* getMaterial () const {
+     std::shared_lock lock{m_mutex};
      return m_material;
   }