Overview

In Omeka S, there is a module called Google Analytics for enabling Google Analytics.

GitHub - Libnamic/Omeka-S-GoogleAnalytics: Includes simple support for Google Analytics in Omeka S
Includes simple support for Google Analytics in Omeka S - Libnamic/Omeka-S-GoogleAnalytics
GitHub

When enabling this module, there were cases where the following error message was displayed.

Undefined index: additional_snippet in (...) /modules/GoogleAnalytics/Module.php on line 316

The following issue had also been raised regarding this.

additional_snippet error · Issue #9 · Libnamic/Omeka-S-GoogleAnalytics
The section where 'additional_snippet' is set in the config form is commented out, but the setting value is referenced on line 316 and 322 in the Module.php leading to the following error message: ...
GitHub

I will share the method for addressing this issue.

Fix Method

Make the following changes.

fix: additional_snippet error by nakamura196 · Pull Request #10 · Libnamic/Omeka-S-GoogleAnalytics
This modification is in response to issue #9.
GitHub

Specifically, the changes are as follows.

Before

            if (empty($extra_snippet)) {
                $settings = $this->getServiceLocator()->get('Omeka\Settings');
                $settings = $settings->get('googleanalytics', '');
                if ($settings != null)
                    $extra_snippet = $settings['additional_snippet'];
            }
            if (empty($extra_snippet)) {
                $settings = $this->getServiceLocator()->get('Omeka\Settings');
                $settings = $settings->get('googleanalytics', '');
                if ($settings != null)
                    $extra_snippet = $settings['additional_snippet'];
            }

After

            if (empty($extra_snippet)) {
                $settings = $this->getServiceLocator()->get('Omeka\Settings');
                $settings = $settings->get('googleanalytics', '');
                if ($settings != null)
                    // Assuming this is part of the code where you handle the extra snippet
                    if (isset($settings['additional_snippet']) && !empty($settings['additional_snippet'])) {
                        $extra_snippet = $settings['additional_snippet'];
                    } else {
                        $extra_snippet = ''; // Default value if 'additional_snippet' key is not set
                    }
            }
            if (empty($extra_snippet)) {
                $settings = $this->getServiceLocator()->get('Omeka\Settings');
                $settings = $settings->get('googleanalytics', '');
                if ($settings != null)
                    // Assuming this is part of the code where you handle the extra snippet
                    if (isset($settings['additional_snippet']) && !empty($settings['additional_snippet'])) {
                        $extra_snippet = $settings['additional_snippet'];
                    } else {
                        $extra_snippet = ''; // Default value if 'additional_snippet' key is not set
                    }
            }

Summary

I am not entirely confident that the above changes are completely correct, but I have also submitted a pull request.

fix: additional_snippet error by nakamura196 · Pull Request #10 · Libnamic/Omeka-S-GoogleAnalytics
This modification is in response to issue #9.
GitHub

I hope this serves as a useful reference.