diff --git a/gui/qt/transaction_dialog.py b/gui/qt/transaction_dialog.py
index 4fc589dd1..8344f82b3 100644
--- a/gui/qt/transaction_dialog.py
+++ b/gui/qt/transaction_dialog.py
@@ -182,8 +182,8 @@ class TxDialog(QDialog, MessageBoxMixin):
             if success:
                 self.prompt_if_unsaved = True
                 self.saved = False
-            self.save_button.setDisabled(False)
-            self.save_button.setToolTip("")
+                self.save_button.setDisabled(False)
+                self.save_button.setToolTip("")
             self.update()
             self.main_window.pop_top_level_window(self)
 
diff --git a/lib/wallet.py b/lib/wallet.py
index 892d66a12..74992cd0b 100644
--- a/lib/wallet.py
+++ b/lib/wallet.py
@@ -778,6 +778,9 @@ class Abstract_Wallet(PrintError):
             return conflicting_txns
 
     def add_transaction(self, tx_hash, tx):
+        assert tx_hash, tx_hash
+        assert tx, tx
+        assert tx.is_complete()
         # we need self.transaction_lock but get_tx_height will take self.lock
         # so we need to take that too here, to enforce order of locks
         with self.lock, self.transaction_lock: