diff --git a/community/calc-widget.lua b/community/calc-widget.lua
index 4be4193..2234de8 100644
--- a/community/calc-widget.lua
+++ b/community/calc-widget.lua
@@ -17,7 +17,7 @@ function on_click()
 end
 
 function on_dialog_action(text)
-    if text == "" then
+    if text == "" or text == -1 then
         on_alarm()
     else
         ui:show_text("Результат: "..calculate_string(text))