The primary reason for patties to fall apart is the consistency of the mixture. Ensure to cook the chickpea mixture until the moisture is completely absorbed. If you are still finding it difficult to keep the patties together, then try adding binding elements such as flax egg, chickpea flour, boiled and mashed potatoes or oats flour. If using mashed potatoes then mix in the patty mixture along with the rest of the ingredients while cooking. If you chose to use flour or flax egg, add it at the end and stir until well combined. The second reason for patties to fall apart is their size. Keep the patty size reasonable.