diff --git a/calc.py b/calc.py
index e7c6b9e4026b2373355f91d2101bb2e8d72a3427..bffda30de14fe151c13a448078fc0598652155d5 100644
--- a/calc.py
+++ b/calc.py
@@ -71,7 +71,8 @@ class Calc(QMainWindow):
                 else:#无y
                     if value != '0':
                         self.y = value
-                self.text_result.setText(self.y)
+                if self.y is not None:
+                    self.text_result.setText(self.y)
 
             else:#无运算符
                 if self.x is not None:#有x
@@ -80,7 +81,8 @@ class Calc(QMainWindow):
                 else:
                     if value != '0':
                         self.x = value
-                self.text_result.setText(self.x)
+                if self.x is not None:
+                    self.text_result.setText(self.x)
 
         
         # 开始处理运算符