diff --git a/compiler/types.nim b/compiler/types.nim
index 4d6bf0502..063eb0757 100644
--- a/compiler/types.nim
+++ b/compiler/types.nim
@@ -541,7 +541,9 @@ proc typeToString(typ: PType, prefer: TPreferedDesc = preferName): string =
     else:
       result.add typeToString(t.sons[0])
   of tyRange:
-    result = "range " & rangeToStr(t.n)
+    result = "range "
+    if t.n != nil and t.n.kind == nkRange:
+      result.add rangeToStr(t.n)
     if prefer != preferExported:
       result.add("(" & typeToString(t.sons[0]) & ")")
   of tyProc: