  Let $(X,\Delta)$ be a log pair over $S$, such that $-(K_X+\Delta)$ is nef
over $S$. It is conjectured that the intersection of the non-klt (non Kawamata
log terminal) locus of $(X,\Delta)$ with any fiber $X_s$ has at most two
connected components. We prove this conjecture in dimension $\leq 4$ and in
arbitrary dimension assuming the termination of klt flips.
