guard against nil once

redsift · Aug 30, 2023 · 95c6057 · 95c6057
1 parent 3946aba
commit 95c6057
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/parser.go b/parser.go
@@ -350,9 +350,10 @@ func (p *parser) fireMatch(t *token, r Result, explanation string, ttl time.Dura
 }
 
 func (p *parser) fireFirstMatch(r Result, e error) {
-	if p.listener == nil {
+	if p.listener == nil || p.fireFirstMatchOnce == nil {
 		return
 	}
+
 	p.fireFirstMatchOnce.Do(func() {
 		p.listener.FirstMatch(r, e)
 	})