request #6729: Fix brundown fatal error

Change-Id: I32c6940b936e3ccef262244aeec96d1472699cef
Merge commit 'refs/changes/13/2313/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #6729: Fix brundown fatal error
This is Tuleap 6.12.99.57

Change-Id: I776629cf4cbdff6acbd7e3de61795f70e49b8e08