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-rw-r--r--mrbgems/mruby-compiler/core/parse.y2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-compiler/core/parse.y b/mrbgems/mruby-compiler/core/parse.y
index cf5f5230f..50bd01ba2 100644
--- a/mrbgems/mruby-compiler/core/parse.y
+++ b/mrbgems/mruby-compiler/core/parse.y
@@ -5952,7 +5952,7 @@ parser_yylex(parser_state *p)
break;
case '_':
- if (toklen(p) == 2 && ISDIGIT(tok(p)[1])) {
+ if (toklen(p) == 2 && ISDIGIT(tok(p)[1]) && p->nvars) {
int n = tok(p)[1] - '0';
node *nvars = p->nvars->car;