# Use `graph::reset()` to Reset a Canceled Graph

When a graph execution is canceled either because of an unhandled exception or because its `task_group_context` is canceled explicitly, the graph and its nodes may be left in an indeterminate state. For example, in the code samples shown in Cancel a Graph Explicitly the input 2 may be left in a buffer. But even beyond remnants in the buffers, there are other optimizations performed during the execution of a flow graph that can leave its nodes and edges in an indeterminate state. If you want to re-execute or restart a graph, you first need to reset the graph:

    try {
        g.wait_for_all();
    } catch ( int j ) {
        cout << "Caught " << j << "\n";
        // do something to fix the problem
        g.reset();
        f1.try_put(1);
        f1.try_put(2);
        g.wait_for_all();
    }