Invalid iterator safety.

3d-viewer/3d_cache/sg/sg_shape.cpp

@@ -752,6 +752,8 @@ bool SGSHAPE::Prepare( const glm::dmat4* aTransform, S3D::MATLIST& materials,
     for( unsigned int i = 0; i < nvidx; ++i )
     {
         mit = indexmap.find( lv[i] );
+
+        if( mit != indexmap.end() )
             lvidx[i] = mit->second;
     }
 

3d-viewer/3d_canvas/create_layer_items.cpp

@@ -797,10 +797,13 @@ void BOARD_ADAPTER::createLayers( REPORTER* aStatusReporter )
                     {
                         auto mut_it = layer_lock.find( layer );
 
+                        if( mut_it != layer_lock.end() )
+                        {
                             std::lock_guard< std::mutex > lock( *( mut_it->second ) );
                             zone->TransformSolidAreasShapesToPolygon( layer, *m_layers_poly[layer] );
                         }
                     }
+                }
 
                 threadsFinished++;
             } );