QUESTION:
I use the module Magento 2 Simple Details on Grouped Product version 1.0.7 for my site Magento 2.3.4.
We don't have a need on MSI so that I disable MSI for the site. Then, we got Fatal Error as below:

Do you have a fix for this?
ANSWER:
To resolve this issue, please edit files as below:
+ app/code/Bss/SimpleDetailGroupedProduct/Block/SimpleDetail.php

+ app/code/Bss/SimpleDetailGroupedProduct/view/frontend/templates/catalog/product/view/type/grouped.phtml

Or download the attached files below and overwrite the current file on your site.
If you have any other question or concern, please feel free to contact us. We'd be happy to support!
BSS Commerce is a trusted Magento 2 extensions provider with 14+ years of experience, serving 75,000+ customers worldwide. We are an Adobe Commerce Solution Bronze Partner and a Select Magento Extensions Builder, reinforcing our expertise in the Magento ecosystem.
We specialize in developing 150+ high-quality Magento 2 extensions that enhance functionality, improve user experience, and support scalable growth. Our reputation is built on long-term partnerships, positive feedback, and proven performance-driven solutions.
Explore our extensions: https://bsscommerce.com/magento-2-extensions.html
You can refer our top tier extensions:
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