diff --git a/.changeset/afraid-panthers-pay.md b/.changeset/afraid-panthers-pay.md
new file mode 100644
index 000000000..196e75591
--- /dev/null
+++ b/.changeset/afraid-panthers-pay.md
@@ -0,0 +1,5 @@
+---
+"@faustwp/wordpress-plugin": patch
+---
+
+Bug: Fixed an issue with the function content_replacement throwing a 500 error for a null value. 
diff --git a/plugins/faustwp/includes/replacement/callbacks.php b/plugins/faustwp/includes/replacement/callbacks.php
index 84f11ca01..8b8214860 100644
--- a/plugins/faustwp/includes/replacement/callbacks.php
+++ b/plugins/faustwp/includes/replacement/callbacks.php
@@ -5,6 +5,8 @@
  * @package FaustWP
  */
 
+declare(strict_types=1);
+
 namespace WPE\FaustWP\Replacement;
 
 use function WPE\FaustWP\Settings\{
@@ -27,40 +29,33 @@
 /**
  * Callback for WordPress 'the_content' filter.
  *
- * @param string $content The post content.
+ * @param ?string $content The post content.
  *
- * @return string The post content.
+ * @return ?string The post content.
  */
-function content_replacement( string $content ): string {
+function content_replacement( ?string $content ) {
 
 	if ( ! $content ) {
-		return '';
+		return $content;
 	}
-
 	$replace_content_urls = domain_replacement_enabled();
 	$replace_media_urls   = ! use_wp_domain_for_media();
-
 	if ( ! $replace_content_urls && ! $replace_media_urls ) {
 		return $content;
 	}
-
 	$wp_site_urls = faustwp_get_wp_site_urls( site_url() );
 	if ( empty( $wp_site_urls ) ) {
 		return $content;
 	}
-
 	$relative_upload_url = faustwp_get_relative_upload_url( $wp_site_urls, wp_upload_dir()['baseurl'] );
 	$wp_media_urls       = faustwp_get_wp_media_urls( $wp_site_urls, $relative_upload_url );
 	$frontend_uri        = (string) faustwp_get_setting( 'frontend_uri' ) ?? '/';
-
 	if ( $replace_content_urls && $replace_media_urls ) {
 		return str_replace( $wp_site_urls, $frontend_uri, $content );
 	}
-
 	if ( $replace_media_urls ) {
 		return str_replace( $wp_media_urls, $frontend_uri . $relative_upload_url, $content );
 	}
-
 	$site_urls_pattern = implode( '|', array_map( 'preg_quote', $wp_site_urls ) );
 	$pattern           = '#(' . $site_urls_pattern . ')(?!' . $relative_upload_url . '(\/|$))#';
 
diff --git a/plugins/faustwp/includes/replacement/functions.php b/plugins/faustwp/includes/replacement/functions.php
index 645aa1eb2..27e4fbda2 100644
--- a/plugins/faustwp/includes/replacement/functions.php
+++ b/plugins/faustwp/includes/replacement/functions.php
@@ -5,6 +5,8 @@
  * @package FaustWP
  */
 
+declare(strict_types=1);
+
 namespace WPE\FaustWP\Replacement;
 
 use function WPE\FaustWP\Settings\{
@@ -144,7 +146,7 @@ function faustwp_get_wp_site_urls( string $site_url ): array {
 
 	$host_url = wp_parse_url( $site_url, PHP_URL_HOST );
 
-	$is_https = strpos( $site_url, 0, 6 ) === 'https:';
+	$is_https = strpos( $site_url, 'https://' ) === 0;
 
 	return apply_filters(
 		'faustwp_get_wp_site_urls',
diff --git a/plugins/faustwp/tests/integration/ReplacementCallbacksTests.php b/plugins/faustwp/tests/integration/ReplacementCallbacksTests.php
index 1e8728d44..9caefbe75 100644
--- a/plugins/faustwp/tests/integration/ReplacementCallbacksTests.php
+++ b/plugins/faustwp/tests/integration/ReplacementCallbacksTests.php
@@ -92,6 +92,17 @@ public function test_wp_calculate_image_srcset_filter(): void {
 		self::assertSame( 10, has_action( 'wp_calculate_image_srcset', 'WPE\FaustWP\Replacement\image_source_srcset_replacement' ) );
 	}
 
+
+	/**
+	 * Test to make sure content rep can accept null values
+	 */
+	public function test_content_replacement_for_different_types() {
+		$this->assertNull(content_replacement( null));
+		$this->assertEmpty(content_replacement(''));
+		$content = '<p>This is a string with no URLs to be replaced.</p>';
+		$this->assertEquals($content, content_replacement($content));
+	}
+
 	/**
 	 * Tests content_replacement() returns original value when content replacement is not enabled.
 	 */