Cant enter "configuration" any more ....

This issue is happening for a while now. I always ignored it, cause the settings are made. But now I want to change the shop currency to US-Dollars  
 "Configuration" ... gives me a database error all other tabs in the backend work well 
Can you help me ?
 

Hello

Please submit a support ticket sending us super admin account of your site. We are going to check to see why the issue happens and get it sorted

Regards,

Tuan