From BBC Live reporting:

17:00
Breaking Government defeated on parliamentary approval of Brexit deal

EU Withdrawal Bill

House of Lords

Parliament

Peers vote 335 to 244 for Viscount Hailsham's amendment.

The amendment attaches extra conditions to parliamentary approval for the deal reached between the EU and the UK, including allowing Parliament to determine the government’s course of action if:
• the final deal is rejected by House of Commons
• the Act that is required to pass before exit is not passed into law
• the deal with the EU is not finalised by 28th Feb 2019

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I have some commentators who say the rumours are the government will accept this without challenge because they do not think they have the numbers to overturn it. However, that is speculation at this point.