Error Pagespeed Insights

Someone can help me fix this error:

InvalidCharacterError: Failed to execute ‘setAttribute’ in ‘Element’: ‘=””‘ is not a valid attribute name. at https://neurinomavestibular.es/:16:11332 at Array.forEach () at litespeed_load_one (https://neurinomavestibular.es/:16:11307) at https://neurinomavestibular.es/:16:10967 at new Promise () at litespeed_load_delayedjs (https://neurinomavestibular.es/:16:10952)

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