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Error message pops up when clicking a existing working button


We have a new user that is experiencing an issue that no one in their same team is facing. We have a custom object which has a button that redirects to send an email window. This issue pops up when this user clicks this custom button, no other user in the same profile/role is facing this problem. Why is this happening ? How can we fix this ? 

Error msg: 'This page isn't available in Salesforce Lightning Experience or Salesforce1.'

However other standard users can click that button and works perfectly for them in lightning. 

Thank you, 
SonamSonam (Salesforce Developers) 
Hi Arman,

Is seems like a strange case you have reported - I checked the cases internally to search for posibilities where thsi could be happening and turns out I did find a similar issue.

THis user was facing an issue with Firefox and IE was working fine for this user when the same button was pressed.

Could you please check with your user to see if browser change makes any difference in ths issue, do report back and I will investigate this further.