Klevu.CRITICAL: Klevu_CatNav_Cleaner::Cleaner ERROR occured :
Deprecated Functionality: ltrim(): 
Passing null to parameter #1 ($string) of type string is deprecated in
 /app/vendor/magento/framework/ObjectManager/ObjectManager.php on line 67 [] []

# Create the patches directory if it does not already exist
mkdir patches/composer -p

# Add the patch file
vi patches/composer/klevu-categorynavigation-2.9.2-preserve-layout-request-model.patch  # add the patch content provided

# Update composer.json to include patch information under "extra" section
vi composer.json

"extra": {
    "patches": {
        "klevu/module-categorynavigation": {
            "Category Navigation 2.9.2 PL Request": "patches/composer/klevu-categorynavigation-2.9.2-preserve-layout-request-model.patch"
        }
    }
}

# Install composer patches if not already available
# Either https://github.com/vaimo/composer-patches
composer require vaimo/composer-patches

# or https://github.com/cweagans/composer-patches
composer require cweagans/composer-patches

# Apply the patch
composer -v install

# Update the composer lock file
composer update --lock