Box2D b2Island::Solve() EXC_BAD_ACCESS

[CoffeeBreakin]

I found a careless mistake.

void b2Island::Solve(b2Profile* profile, const b2TimeStep& step, const b2Vec2& gravity, bool allowSleep)
{
...
for (int32 j = 0; j < m_jointCount; ++j)
{
bool jointOkay = m_joints[i]->SolvePositionConstraints(solverData);
jointsOkay = jointsOkay && jointOkay;
}
...

m_joints[i] ---> m_joints[j]