diff options
| -rw-r--r-- | src/interp.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/src/interp.c b/src/interp.c index 542ddd7..89fa63f 100644 --- a/src/interp.c +++ b/src/interp.c @@ -1106,7 +1106,9 @@ double eval(register struct ent * ent, register struct enode * e) { // here we store the dependences in a graph if (ent && vp) { - if (GraphIsReachable(getVertex(graph, lookat(ent->row, ent->col), 0), getVertex(graph, lookat(vp->row, vp->col), 0), 1)) { + vertexT * v_ent = getVertex(graph, lookat(ent->row, ent->col), 0); + vertexT * v_vp = getVertex(graph, lookat(vp->row, vp->col), 0); + if (v_ent != NULL && v_vp != NULL && GraphIsReachable(v_ent, v_vp, 1)) { sc_debug("Circular reference in eval (cell %s%d)", coltoa(vp->col), vp->row); e->op = ERR_; e->e.o.left = NULL; |