Nupack error with subsequent pknot refold

[luxaritas]

Expected Behavior

No error/crash

Current Behavior

Error in backtrack Fg_N5, 10 22 40 56

      at Object.put_char (../node_modules/eternajs-folding-engines/engines/nupack.js:913:5)

  console.error
    FullFoldTemperature error ExitStatus {
      name: 'ExitStatus',
      message: 'Program terminated with exit(1)',
      status: 1
    }

Reproduction Steps

In puzzlemaker:

• Reset puzzlemaker
• Switch to nupack
• Paste structure .((({{..((((.....)))).))).((((((...{{{....)))).........}}}..........}}.))...
• Paste sequence AGCACGUUUCGAAAAAAUCGAUUGCACCCAGAACACGCAAAAUCUGAAAAAAAAAGCGAAACAAAAAUCGAGGUGC

In unit test:

await nupack = NuPACK.create();
// Works
nupack.foldSequence(Sequence.fromSequenceString("AGCACGUUUCGAAAAAAUCGAUUGCACCCAGAACACGCAAAAUCUGAAAAAAAAAGCGAAACAAAAAUCGAGGUGG"), null, null, true, 37);
// Crash
nupack.foldSequence(Sequence.fromSequenceString("AGCACGUUUCGAAAAAAUCGAUUGCACCCAGAACACGCAAAAUCUGAAAAAAAAAGCGAAACAAAAAUCGAGGUGC"), null, null, true, 37);

Note that if the problem sequence is the first fold to happen when the engine is loaded, all is fine. This only occurs on subsequent folds. I'm guessing there's some nupack global not being reset properly or memory corruption or something.

Environment

No response

Other information

https://forum.eternagame.org/t/error-on-mutation-in-pseudoknot-puzzle/4697/7