** Updated **
Compatible with AI Engine 2.9.9

This JavaScript will recover the message sent by the user if they receive an error:

document.addEventListener('DOMContentLoaded', () => {
    const startTime = Date.now();
    const maxWaitTime = 3000; // 3 seconds

    const initializeWhenReady = () => {
        const mwaiInputDivs = document.querySelectorAll('div.mwai-input-text');
        if (mwaiInputDivs.length > 0 && typeof MwaiAPI !== 'undefined') {
            mwaiInputDivs.forEach(mwaiInputDiv => {
                let lastSent = '';
                const textarea = mwaiInputDiv.querySelector('textarea');
                textarea?.addEventListener('input', () => {
                    if (textarea.value.trim()) lastSent = textarea.value;
                });

                setInterval(() => {
                    const errorDivs = mwaiInputDiv.closest('.mwai-chat').querySelectorAll('div.mwai-error');
                    errorDivs.forEach(div => {
                        if (div.querySelector('span') && lastSent && !textarea.value.trim()) {
                            const chatbotElement = mwaiInputDiv.closest('.mwai-chat');
                            const botId = chatbotElement ? chatbotElement.id.replace('mwai-chatbot-', '') : '';
                            (botId ? MwaiAPI.getChatbot(botId) : MwaiAPI.chatbots[0]).ask(lastSent, false);
                        }
                    });
                }, 500);
            });
        } else if (Date.now() - startTime < maxWaitTime) {
            requestAnimationFrame(initializeWhenReady);
        }
    };

    initializeWhenReady();
}, true);

** Updated **
Now passes through query limit errors and shows the real errors to admins.

This PHP will allow you to change the text that displays for each error:

add_filter( 'mwai_ai_exception', function ( $exception ) {
	if (current_user_can('administrator')) { return $exception; } // admin should see the real error

    $error_messages = array(
		// will look for 'overloaded' in the exception message and return a specific message if found
        'Overloaded' => 'The system is currently overloaded. Please try again in 10 seconds.',
		'Some Other Error' => 'Some other error message.',
    );

    $use_email = false; // will use support_url link if false
    $my_email = ''; // set your email address here - leave blank to use admin email
    $admin_email = $my_email ? $my_email : get_option('admin_email');
    $support_url = 'https://www.insightengine.online/contact-me/'; // optional support URL

    $link_url = $use_email ? 'mailto:' . $admin_email : $support_url;

	// change this to suit your needs
    $fallback_message = 'An error has occurred. Please [contact me](' . $link_url . ') if this continues.';

	global $mwai_core;
	$limits = $mwai_core->get_option( 'limits' );
	$skip_errors = isset( $limits['enabled'] ) && $limits['enabled'] ? array($limits['system']['overLimitMessage'], $limits['users']['overLimitMessage'], $limits['guests']['overLimitMessage']) : array();
	if (in_array($exception, $skip_errors)) { return $exception; }

    try {
        foreach ($error_messages as $error_key => $error_message) {
            if (stripos($exception, $error_key) !== false) {
                return $error_message;
            }
        }
        return $fallback_message;
    }
    catch ( Exception $e ) {
        error_log( $e->getMessage() );
    }
    return $exception;
} );

Edit the commented settings in the PHP before placing it on your website.

Note that $admin_email will use the “Administration Email Address” set in your WordPress settings.

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