Erro no console ao abrir página do signup

Ao entrar na página de signup, é exibido o seguinte erro no console:

Error in event handler: TypeError: object null is not iterable (cannot read property Symbol(Symbol.iterator)) signup:1 
    at n (chrome-extension://jdcfmebflppkljibgpdlboifpcaalolg/content-scripts/cart-tracking/loader.js:1:2609)
    at Object.getPageConfig (chrome-extension://jdcfmebflppkljibgpdlboifpcaalolg/content-scripts/cart-tracking/loader.js:1:3771)
    at Object.injectContent (chrome-extension://jdcfmebflppkljibgpdlboifpcaalolg/content-scripts/cart-tracking/loader.js:1:3954)
    at onMessage (chrome-extension://jdcfmebflppkljibgpdlboifpcaalolg/content-scripts/cart-tracking/loader.js:1:4171)

Aparentemente o formulário está funcionando igual, mas gostaria de entender e resolver o erro.