Bug in GroupActivity.execute(ExecutionImpl execution)

just browsing through the codebase and trying to understand the magic,
I came across this in line 56 of GroupActivity.java:

ExecutionImpl concurrentRoot = null;

if (Execution.STATE_ACTIVE_ROOT.equals(execution.getState()))

{ concurrentRoot = execution; }

else if (Execution.STATE_ACTIVE_ROOT.equals(execution.getState()))

{ concurrentRoot = execution.getParent(); }

else

{ throw new JbpmException("illegal state"); }

I assume getState() doesn't have any side effects, so I guess this is a bug