[Fix #12848] Fix an error for RuboCop::Lockfile

Fixes #12848. This PR fixes an error that occurs in `RuboCop::Lockfile` when the constant Bundler is uninitialized.
rubocop · Apr 19, 2024 · c30838d · c30838d
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commit c30838d
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diff --git a/changelog/fix_error_for_rubocop_lockfile.md b/changelog/fix_error_for_rubocop_lockfile.md
@@ -0,0 +1 @@
+* [#12848](https://github.com/rubocop/rubocop/issues/12848): Fix an error that occurs in `RuboCop::Lockfile` when the constant Bundler is uninitialized. ([@koic][])
diff --git a/lib/rubocop/lockfile.rb b/lib/rubocop/lockfile.rb
@@ -60,7 +60,7 @@ def includes_gem?(name)
     def parser
       return @parser if defined?(@parser)
 
-      @parser = if @lockfile_path
+      @parser = if @lockfile_path && bundler_lock_parser_defined?
                   begin
                     lockfile = ::Bundler.read_file(@lockfile_path)
                     ::Bundler::LockfileParser.new(lockfile) if lockfile