diff --git a/compiler/renderer.nim b/compiler/renderer.nim
index 03f6d4832..f0ee137e9 100644
--- a/compiler/renderer.nim
+++ b/compiler/renderer.nim
@@ -802,7 +802,7 @@ proc doParamsAux(g: var TSrcGen, params: PNode) =
     gsemicolon(g, params, 1)
     put(g, tkParRi, ")")
 
-  if params.sons[0].kind != nkEmpty:
+  if params.len > 0 and params.sons[0].kind != nkEmpty:
     putWithSpace(g, tkOpr, "->")
     gsub(g, params.sons[0])