Return nullptr from GetLegacyScriptPubKeyMan if descriptor wallet

src/wallet/wallet.cpp

@@ -4353,6 +4353,9 @@ std::unique_ptr<SigningProvider> CWallet::GetSolvingProvider(const CScript& scri
 
 LegacyScriptPubKeyMan* CWallet::GetLegacyScriptPubKeyMan() const
 {
+    if (IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
+        return nullptr;
+    }
     // Legacy wallets only have one ScriptPubKeyMan which is a LegacyScriptPubKeyMan.
     // Everything in m_internal_spk_managers and m_external_spk_managers point to the same legacyScriptPubKeyMan.
     auto it = m_internal_spk_managers.find(OutputType::LEGACY);
@@ -4368,7 +4371,7 @@ LegacyScriptPubKeyMan* CWallet::GetOrCreateLegacyScriptPubKeyMan()
 
 void CWallet::SetupLegacyScriptPubKeyMan()
 {
-    if (!m_internal_spk_managers.empty() || !m_external_spk_managers.empty() || !m_spk_managers.empty()) {
+    if (!m_internal_spk_managers.empty() || !m_external_spk_managers.empty() || !m_spk_managers.empty() || IsWalletFlagSet(WALLET_FLAG_DESCRIPTORS)) {
         return;
     }