diff --git a/dup_expr.cc b/dup_expr.cc
index 5c1158b9f..7a8ec8a76 100644
--- a/dup_expr.cc
+++ b/dup_expr.cc
@@ -94,9 +94,10 @@ NetESFunc* NetESFunc::dup_expr() const
 
 NetESignal* NetESignal::dup_expr() const
 {
-      NetESignal*tmp = new NetESignal(net_);
+      NetESignal*tmp = new NetESignal(net_, word_);
       assert(tmp);
       tmp->expr_width(expr_width());
+      tmp->set_line(*this);
       return tmp;
 }
 
diff --git a/tgt-vvp/eval_expr.c b/tgt-vvp/eval_expr.c
index 4a6d09d8b..03e43823f 100644
--- a/tgt-vvp/eval_expr.c
+++ b/tgt-vvp/eval_expr.c
@@ -2336,7 +2336,7 @@ struct vector_info draw_eval_expr_wid(ivl_expr_t exp, unsigned wid,
 	    fprintf(stderr, "%s:%u:  vvp-tgt error: unhandled expr. type: "
 	            "%u at %s:%d\n", ivl_expr_file(exp), ivl_expr_lineno(exp),
                     ivl_expr_type(exp), __FILE__, __LINE__);
-	    assert(0);
+	    exit(1);
 	    res.base = 0;
 	    res.wid = 0;
 	    break;