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Cannot read properties of null (reading 'classList')

Answered
brian mulh asked on April 8, 2025

We occasionally get an error of "Cannot read properties of null (reading 'classList')".   This appears to be occurring on line 154 of flexmonster.js.  We are using version 2.9.100.

 

I also saw the error "Cannot read properties of null (reading 'firstChild')" occur on line 1995.

6 answers

Public
Solomiia Andrusiv Solomiia Andrusiv Flexmonster April 9, 2025

Hello, Brian!

Thank you for reaching out to us.

Our team kindly asks you to provide a minimal reproducible sample of the described behavior so we can test it on our side.

Looking forward to hearing your response.

Kind regards,
Solomiia

Public
brian mulh April 9, 2025

I haven't been able to reliably reproduce the issue.  Seems somewhat random.  I will try to narrow down when it occurs to be able to reproduce it.

Public
Solomiia Andrusiv Solomiia Andrusiv Flexmonster April 9, 2025

Hello, Brian!

Thank you for your swift response.

We'll be waiting for the following updates on the case.

Kind regards,
Solomiia

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Solomiia Andrusiv Solomiia Andrusiv Flexmonster 7 days ago

Hello, Brian!

Hope you are doing well.

Just checking in to ask if there are updates on the case with the mentioned "Cannot read properties of null" error in Flexmonster. We are waiting for the reproducible sample to investigate the case further.

Looking forward to hearing from you.

Kind regards,
Solomiia

 

Public
brian mulh 7 days ago

I have not been able to reliably reproduce it.  If I am I will add an example here.

Public
Solomiia Andrusiv Solomiia Andrusiv Flexmonster 6 days ago

Hi, Brian!

Thank you for the update.

Feel free to reach out as soon as the behavior is reproducible, so we can continue working on this case.

Best regards,
Solomiia

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