qt history list: fix #6746

electrum/util.py

@@ -219,6 +219,8 @@ class Fiat(object):
             return "{:.2f}".format(self.value) + ' ' + self.ccy
 
     def __eq__(self, other):
+        if not isinstance(other, Fiat):
+            return False
         if self.ccy != other.ccy:
             return False
         if isinstance(self.value, Decimal) and isinstance(other.value, Decimal) \