diff --git a/compiler/renderer.nim b/compiler/renderer.nim
index 966bed7697..75c19a1638 100644
--- a/compiler/renderer.nim
+++ b/compiler/renderer.nim
@@ -189,7 +189,7 @@ proc putComment(g: var TSrcGen, s: string) =
       put(g, tkComment, com)
       com = "## "
       inc(i)
-      if s[i] == '\x0A': inc(i)
+      if i < s.len and s[i] == '\x0A': inc(i)
       optNL(g, ind)
     of '\x0A':
       put(g, tkComment, com)