wallet: try detecting internal address corruption

electrum/gui/qt/request_list.py

@@ -31,6 +31,7 @@ from electrum.i18n import _
 from electrum.util import format_time, age
 from electrum.plugin import run_hook
 from electrum.paymentrequest import PR_UNKNOWN
+from electrum.wallet import InternalAddressCorruption
 
 from .util import MyTreeView, pr_tooltips, pr_icons
 
@@ -78,7 +79,11 @@ class RequestList(MyTreeView):
         # update the receive address if necessary
         current_address = self.parent.receive_address_e.text()
         domain = self.wallet.get_receiving_addresses()
-        addr = self.wallet.get_unused_address()
+        try:
+            addr = self.wallet.get_unused_address()
+        except InternalAddressCorruption as e:
+            self.parent.show_error(str(e))
+            addr = ''
         if not current_address in domain and addr:
             self.parent.set_receive_address(addr)
         self.parent.new_request_button.setEnabled(addr != current_address)