Deeds and deposit worry

Hello all

Here's the problem / nightmare we have ...

We're first-time buyers.

I work and my partner doesn't. Because of this, the lender advised we have a single mortgage with only my name on it.

The deposit is coming entirely from my partner however.

Our solicitor today advised that the lender "security" will reject this because having a person whose name is not on the deeds providing deposit is a big no-no.

This has come as something of a shock.

Can anyone please advise or calm my panic?