UI Error when new mason uses previous masons workshop with maintain tasks

Summary:
UI Error when new mason uses previous masons workshop with maintain tasks.

Steps to reproduce:

  1. Create Mason
  2. Level to add build task to maintain a number of stone chests
  3. Upgrade Mason to different job
  4. Create new Mason
  5. Do not create new workshop but make new Mason use existing
    Note: I do not remember seeing the maintain task listed.
  6. Level Mason to lvl 2
  7. Open workshop
  8. Received UI Error

Expected Results:
Maybe clear tasks when the Mason is changed? Might case an issue if there are more than one Mason to start.

Actual Results:
Received UI Error.

Notes:
I have not tried to reproduce this yet.

Attachments:

Version Number and Mods in use:
realease-523 (x64) no mods
fa01894a-cdcb-11e5-bbfb-1c872c73982d

System Information:
Win 10 64x

Hey there @atobison, welcome to the Discourse! Do you by chance have the UI error? I followed your repro steps, and did not receive an error.