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Rujuta HonraoRujuta Honrao 

visualforce page not working in salesforce classic

Hello, 
I have created a visualforce page custom button on List View of Lead object. This button is visible in Salesforce Classic and Liightning both. When I click on the button in Lightning, it is working as expected and redirecting to the url specified in it's visualforce page. But when I click on this button in Classic it is not working as expected and returns on the List View page itself. Previously when I created it, it was working well and so did not create a javascript button specifically for classic, instead made a visualforce page which can be good for both, but now the visualforce page is not working. What can be the issue and how to resolve it ? Is there any impact of Winter'20 release ?