diff --git src/bp-core/bp-core-filters.php src/bp-core/bp-core-filters.php
index 080ab60..cf78dcf 100644
--- src/bp-core/bp-core-filters.php
+++ src/bp-core/bp-core-filters.php
@@ -571,7 +571,7 @@ function bp_modify_page_title( $title = '', $sep = '»', $seplocation = 'ri
 	 * @link https://buddypress.trac.wordpress.org/ticket/6107
 	 * @see wp_title()
 	 */
-	$title_tag_compatibility = (bool) ( ! empty( $_wp_theme_features['title-tag'] ) || strstr( $title, $blogname ) );
+	$title_tag_compatibility = (bool) ( ! empty( $_wp_theme_features['title-tag'] ) || ( ! empty( $blogname ) && strstr( $title, $blogname ) ) );
 
 	// Append the site title to title parts if theme supports title tag.
 	if ( true === $title_tag_compatibility ) {