diff --git a/basicswap/basicswap.py b/basicswap/basicswap.py
index 4039bc0..11ea19e 100644
--- a/basicswap/basicswap.py
+++ b/basicswap/basicswap.py
@@ -1230,12 +1230,15 @@ class BasicSwap(BaseApp):
         self.setStringKV(key_str, addr)
         return addr
 
+    def getCachedMainWalletAddress(self, ci):
+        return self.getStringKV('main_wallet_addr_' + ci.coin_name().lower())
+
     def checkWalletSeed(self, c):
         ci = self.ci(c)
         if c == Coins.PART:
             return True  # TODO
         if c == Coins.XMR:
-            expect_address = self.getStringKV('main_wallet_addr_' + ci.coin_name().lower())
+            expect_address = self.getCachedMainWalletAddress(ci)
             if expect_address is None:
                 self.log.warning('Can\'t find expected main wallet address for coin {}'.format(ci.coin_name()))
                 return False
@@ -4281,7 +4284,7 @@ class BasicSwap(BaseApp):
         vkbs = ci_to.sumKeys(kbsl, kbsf)
 
         try:
-            address_to = ci_to.getMainWalletAddress()  # TODO: cache main wallet address to reduce network traffic
+            address_to = self.getCachedMainWalletAddress(ci_to)
             txid = ci_to.spendBLockTx(address_to, xmr_swap.vkbv, vkbs, bid.amount_to, xmr_offer.b_fee_rate, xmr_swap.b_restore_height)
             self.log.debug('Submitted lock B spend txn %s to %s chain for bid %s', txid.hex(), ci_to.coin_name(), bid_id.hex())
             self.logBidEvent(bid.bid_id, EventLogTypes.LOCK_TX_B_SPEND_TX_PUBLISHED, '', session)
@@ -4337,7 +4340,7 @@ class BasicSwap(BaseApp):
         vkbs = ci_to.sumKeys(kbsl, kbsf)
 
         try:
-            address_to = ci_to.getMainWalletAddress()
+            address_to = self.getCachedMainWalletAddress(ci_to)
             txid = ci_to.spendBLockTx(address_to, xmr_swap.vkbv, vkbs, bid.amount_to, xmr_offer.b_fee_rate, xmr_swap.b_restore_height)
             self.log.debug('Submitted lock B refund txn %s to %s chain for bid %s', txid.hex(), ci_to.coin_name(), bid_id.hex())
             self.logBidEvent(bid.bid_id, EventLogTypes.LOCK_TX_B_REFUND_TX_PUBLISHED, '', session)
diff --git a/basicswap/http_server.py b/basicswap/http_server.py
index c45c8d2..cbb01c6 100644
--- a/basicswap/http_server.py
+++ b/basicswap/http_server.py
@@ -89,7 +89,7 @@ def validateTextInput(text, name, messages, max_length=None):
     if max_length is not None and len(text) > max_length:
         messages.append(f'Error: {name} is too long')
         return False
-    if len(text) > 0 and text.isalnum() is False:
+    if len(text) > 0 and all(c.isalnum() or c.isspace() for c in text) is False:
         messages.append(f'Error: {name} must consist of only letters and digits')
         return False
     return True
diff --git a/tests/basicswap/test_xmr.py b/tests/basicswap/test_xmr.py
index c69aa6e..0a42f4e 100644
--- a/tests/basicswap/test_xmr.py
+++ b/tests/basicswap/test_xmr.py
@@ -371,6 +371,9 @@ class Test(unittest.TestCase):
                 sc.setDaemonPID(Coins.BTC, cls.btc_daemons[i].pid)
                 sc.setDaemonPID(Coins.PART, cls.part_daemons[i].pid)
                 sc.start()
+                # Set XMR main wallet address
+                xmr_ci = sc.ci(Coins.XMR)
+                sc.setStringKV('main_wallet_addr_' + xmr_ci.coin_name().lower(), xmr_ci.getMainWalletAddress())
                 cls.swap_clients.append(sc)
 
                 t = HttpThread(cls.swap_clients[i].fp, TEST_HTTP_HOST, TEST_HTTP_PORT + i, False, cls.swap_clients[i])
@@ -520,7 +523,7 @@ class Test(unittest.TestCase):
                 found = True
         assert(found is False)
 
-        # Reenable
+        # Re-enable
         post_json = {
             'address': new_address,
             'active_ind': '1',