I'm using Geant4 10.04 patch01, but I think the code base hasn't changed on this topic.

When you invoke `G4PhysicsTable::insertAt()` it won't check the table size, so it sometimes tries to insert on empty vectors, and it will crash.

For example, the following code will crash at `physics_table_->insertAt(4, v);`.

```cpp
auto physics_table_ = new G4PhysicsTable(10); // specify the table size as 10 in its constructor, but it does only reserve() rather than resize()
auto v = new G4PhysicsOrderedFreeVector();
physics_table_->insertAt(4, v);
delete physics_table_;
delete v;
```

As a comparison, the following code works.

```cpp
auto physics_table_ = new G4PhysicsTable(); // not specify the table size
physics_table_->resize(10);  // make sure the table size is 10
auto v = new G4PhysicsOrderedFreeVector();
physics_table_->insertAt(4, v);
delete physics_table_;
delete v;
```