[SOLVED] cyclic dependencies via parents - creating a stack overflow

One user entered dependencies in the project, effectively disabling the planning functionality.

He created a milestone. Then an activity with a successor link to that milestone. A sub-activity had the same milestone as a predecessor. This created a cycle via a parent.

When pressing the planning button - i get no response, probably there is a stack overflow message on the remote server. Using traceLog i was able to pinpoint the problem.

In model/PlanningElement in the function initializeFullList($list) there is a call to a recursive function self::getRecursivePredecessor($directPredecessors,...) which keeps running and probably running out of space.

What is the best idea and place to discover cycles in the planning structure?

(third trial to add my solution)

I added a check to the getRecursivePredecessor function in PlanningElement.php The added argument $visited keeps tabs on which $idPrec are already visited. Therefore it will prevent a stack overflow. It seems that the dependency check also used this function and wasn't able to discover a cycle due to the stack overflow.