diff --git a/src/debug/dwarf/entry.go b/src/debug/dwarf/entry.go
index 5bb4297..f1215d2 100644
--- a/src/debug/dwarf/entry.go
+++ b/src/debug/dwarf/entry.go
@@ -975,9 +975,12 @@
 		u := &r.d.unit[unit]
 		r.b = makeBuf(r.d, u, "info", u.off, u.data)
 		e, err := r.Next()
-		if err != nil || e == nil || e.Tag == 0 {
+		if err != nil {
 			return nil, err
 		}
+		if e == nil || e.Tag == 0 {
+			return nil, ErrUnknownPC
+		}
 		ranges, err := r.d.Ranges(e)
 		if err != nil {
 			return nil, err