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-rw-r--r--ext/ripper/lib/ripper/lexer.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/ripper/lib/ripper/lexer.rb b/ext/ripper/lib/ripper/lexer.rb
index 19c59e2ccc..6a3c04af30 100644
--- a/ext/ripper/lib/ripper/lexer.rb
+++ b/ext/ripper/lib/ripper/lexer.rb
@@ -228,7 +228,7 @@ class Ripper
def on_heredoc_end(tok)
@buf.push Elem.new([lineno(), column()], __callee__, tok, state())
- @buf = @stack.pop
+ @buf = @stack.pop unless @stack.empty?
end
def _push_token(tok)