Merge pull request pybamm-team#2822 from pybamm-team/issue-2788-last-state

Fix use of last-state as starting-solution in Simulation.solve()

Author: martinjrobins

CHANGELOG.md

@@ -15,6 +15,7 @@
 - Improved `model.latexify()` to have a cleaner and more readable output ([#2764](https://github.com/pybamm-team/PyBaMM/pull/2764))
 - Fixed electrolyte conservation in the case of concentration-dependent transference number ([#2758](https://github.com/pybamm-team/PyBaMM/pull/2758))
 - Fixed `plot_voltage_components` so that the sum of overpotentials is now equal to the voltage ([#2740](https://github.com/pybamm-team/PyBaMM/pull/2740))
+- Fixed use of last_state as starting_solution in Simulation.solve() ([#2822](https://github.com/pybamm-team/PyBaMM/pull/2822))
 
 ## Optimizations
 

pybamm/simulation.py

@@ -652,7 +652,7 @@ def solve(
                     cycle_sum_vars,
                     cycle_first_state,
                 ) = pybamm.make_cycle_solution(
-                    starting_solution.steps,
+                    [starting_solution],
                     esoh_solver=esoh_solver,
                     save_this_cycle=True,
                 )