fix(#573): Guard null assertion crash risk in MultiSigSetup.tsx#634
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Adds an explicit null check at the top of validateSigners() so TypeScript no longer relies on the non-null assertion operator and a crash cannot occur if the function is ever invoked before the wallet is available.
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Summary
if (!wallet) return nullguard at the top ofvalidateSigners()so the function is self-contained and safewallet!.publicKeynon-null assertion;wallet.publicKeyis now used after the guard narrows the typeChanges
src/components/Wallet/MultiSigSetup.tsx— added null guard invalidateSigners(), removed!assertion on line ~75Test plan
MultiSigSetupwithwallet={null}— placeholder renders, no crashCloses #573