Pierre Stephan

Tired of “undefined index” or “could_not_set” warnings in your debug.log file? 
Cron Error Silence is a lightweight, zero-impact WordPress plugin that automatically suppresses non-critical cron-related PHP warnings while keeping all scheduled tasks running perfectly.
Ideal for developers, staging environments, or performance-focused admins who want readable logs without breaking functionality.
<h3>Features</h3>
<ul>
<li>🔇 Suppresses “Undefined array key” cron warnings</li>
<li>🛡️ Prevents “could_not_set” cron errors from cluttering logs</li>
<li>💯 Keeps WordPress cron system fully functional</li>
<li>✨ No performance loss</li>
<li>⚙️ Works alongside caching and optimization plugins</li>
<li>✅ Fully automatic and safe to use</li>
</ul>

Cron Error Silence

Silence noisy WordPress cron-related error messages and clean up your debug logs – without affecting core functionality.

tamlyn

As a theme developer, you want to have WP_DEBUG enabled but you’re not interested in the deprecated warnings created by other plugins. Use this plugin to disable these messages while still displaying other errors, warnings and notices.
<a href="http://outlandishideas.co.uk/blog/2012/06/hide-deprecated-errors-in-wordpress/" rel="nofollow ugc">Plugin by Outlandish Ideas</a>

Disable Deprecated Warnings

Prevents plugins from showing deprecated errors in the WordPress admin.

Cron Error Silence vs Disable Deprecated Warnings