Bug Report: PHP Deprecated Notices and Warning

I’m seeing several PHP errors/warnings generated by the current version of the Donation Thermometer plugin on our WordPress site.

The plugin is fully up to date.

The following messages are being recorded in the WordPress debug log:

1. PHP Deprecated – line 18

explode(): Passing null to parameter #2 ($string) of type string is deprecated

File:

donation-thermometer/includes/therm_widget.php

Line:

18

2. PHP Warning – line 24

array_sum(): Addition is not supported on type string

File:

donation-thermometer/includes/therm_widget.php

Line:

24

3. PHP Deprecated – line 25

explode(): Passing null to parameter #2 ($string) of type string is deprecated

File:

donation-thermometer/includes/therm_widget.php

Line:

25

All three messages occur at the same time while the plugin is being used.

The relevant debug-log entries are:

[18-Aug-2026 14:39:20 UTC] PHP Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /home/i999o3lb38sr/public_html/dev.conejogardens.com/wp-content/plugins/donation-thermometer/includes/therm_widget.php on line 18

[18-Aug-2026 14:39:20 UTC] PHP Warning: array_sum(): Addition is not supported on type string in /home/i999o3lb38sr/public_html/dev.conejogardens.com/wp-content/plugins/donation-thermometer/includes/therm_widget.php on line 24

[18-Aug-2026 14:39:20 UTC] PHP Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /home/i999o3lb38sr/public_html/dev.conejogardens.com/wp-content/plugins/donation-thermometer/includes/therm_widget.php on line 25

Could you please investigate whether the plugin is passing an unexpected null value into explode() and/or a string value into array_sum()?

We have not modified the plugin’s code.

Please let me know if you need additional information about the configuration or environment to reproduce the issue.

Thank you.