catch panics

lex/lex.go

 package lex
 
 import (
+	"log"
+	"time"
 	"unicode/utf8"
 )
 
@@ -140,6 +142,13 @@ func (c *CompoundBuilder) Reset() {
 var _ Builder = (*CompoundBuilder)(nil)
 
 func (L *Lexer) next() Token {
+	defer func() {
+		if r := recover(); r != nil {
+			log.Println("panic in query:", L.str)
+			log.Println(r)
+			time.Sleep(5 * time.Second)
+		}
+	}()
 	L.builder.Reset()
 	first := true
 	for {