Web scenario edit page (I reproduce this issue in template, witch is linked to the other hosts)
Enter new application and double click on the save button.

Error in query [INSERT INTO applications (name,hostid,applicationid) VALUES ('CPUXX','10125','500')] [Duplicate entry '10125-CPUXX' for key 2]
SQL statement execution has failed "INSERT INTO applications (name,hostid,applicationid) VALUES ('CPUXX','10125','500')".
Cannot add new application "CPUXX".