Redmine

This problem was reported as a part of #12955 by Daniel Felix five years ago. I confirmed that the latest versions of Redmine (3.4 and trunk) are still affected.

The helper for the estimated time doesn't check the correctness of the string. For example, you can define hours by 2h30m to get 2.5 or 3h5m to get 3.08 as timevalue. But if you enter abc or 3j (misstyped) the string isn't checked. The issue just returns "update successfully" and sets the estimated time to nil. The string should be checked and should raise some error, if the input isn't correct.