More perf tweaks

1 files changed, 1 insertions, 1 deletions

diff --git a/parser.go b/parser.go
index 2477bb4..62383b9 100644
--- a/parser.go
+++ b/parser.go
@@ -85,7 +85,7 @@ func Exact(match string) Parser {
 		matchByte := match[0]
 		return NewParser(match, func(ps *State) Node {
 			ps.AutoWS()
-			if ps.Input[ps.Pos] != matchByte {
+			if ps.Pos >= len(ps.Input) || ps.Input[ps.Pos] != matchByte {
 				ps.ErrorHere(match)
 				return Node{}
 			}