diff --git a/qsh/__init__.py b/qsh/__init__.py
index 936ebd7..defd282 100644
--- a/qsh/__init__.py
+++ b/qsh/__init__.py
@@ -427,7 +427,7 @@ def read_quotes_data(self):
             volume = self.read_leb128()
 
             if volume == 0:
-                del self.quotes_dict[self.quotes_last_price]
+                self.quotes_dict.pop(self.quotes_last_price, None)
             else:
                 self.quotes_dict[self.quotes_last_price] = volume