Our Sale fell through - What next?

We put our house on the market last year and went sale agreed. The sale fell through and we went back to market. As we had our eye on a house, we didn’t want to wait for any bidding wars and specified to our E.A if a bidder offered X amount we’d take it and the house went sale agreed pretty quickly the second time. After a few weeks, we found a house we loved, made an offer which was accepted and happy days, we’re ready to go! As far as we were concerned, contracts were due to be signed by all parties in the coming weeks. We got word earlier today that our buyers have pulled out!!! What happens now? Our offer on the new house was on the basis that we were sale agreed and the offer was based on the price we had accepted on our house. Does the whole chain crash now or is it in anyway salvageable?