Warning: array offset on float in class-evaluate-phpspreadsheet.php (fix include

Hi,

I’m using the latest version of TablePress and encountered repeated warnings in the PHP-FPM/Nginx error log:

PHP Warning: Trying to access array offset on float in /wp-content/plugins/tablepress/classes/class-evaluate-phpspreadsheet.php on line 49

It occurs during formula evaluation inside:

TablePress_Evaluate_PHPSpreadsheet::evaluate_table_data()

Specifically, at this line:

if ( '' === $cell_content || '=' === $cell_content || '=' !== $cell_content[0] ) {

When $cell_content is a float or integer (not a string), accessing $cell_content[0] causes:

Trying to access array offset on float

This happened because my plugin populates the table with numeric values (floats/ints), not only strings.

============Temporary Fix That Resolved It============

Before the condition, I added an explicit cast:

$cell_content = (string) $cell_content;

This avoids the warning entirely and everything works normally. Additional Context

I also noticed high CPU usage around the same time, but I can’t confirm that this warning is directly responsible. Mentioning it only because the error log was filled with thousands of these warnings.

============Environment============

• Block Theme: no
• TablePress: 3.2.5
• TablePress (DB): 119
• TablePress table scheme: 3
• Plan: Free
• Plugin installed: 2024/04/16 14:04:50
• WordPress: 6.8.3
• Multisite: no
• PHP: 8.3.10
• mySQL (Server): 10.5.25-MariaDB
• mySQL (Client): mysqlnd 8.3.10
• mbstring: yes
• ZipArchive: no
• DOMDocument: yes
• simplexml_load_string: yes
• libxml_disable_entity_loader: yes
• UTF-8 conversion: yes
• WP Memory Limit: 40M
• Server Memory Limit: 256M
• WP_DEBUG: false
• WP_POST_REVISIONS: true