diff --git src/bp-core/bp-core-filters.php src/bp-core/bp-core-filters.php
index 4521b1d58..adc38a5ab 100644
--- src/bp-core/bp-core-filters.php
+++ src/bp-core/bp-core-filters.php
@@ -477,7 +477,7 @@ function bp_core_activation_signup_blog_notification( $domain, $path, $title, $u
 	);
 
 	$salutation = $user;
-	if ( $signups ) {
+	if ( $signups && bp_is_active( 'xprofile' ) ) {
 		$signup = $signups['signups'][0];
 		if ( isset( $signup->meta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
 			$salutation = $signup->meta[ 'field_' . bp_xprofile_fullname_field_id() ];
@@ -539,7 +539,7 @@ function bp_core_activation_signup_user_notification( $user, $user_email, $key,
 	}
 
 	$salutation = $user;
-	if ( isset( $meta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
+	if ( bp_is_active( 'xprofile' ) && isset( $meta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
 		$salutation = $meta[ 'field_' . bp_xprofile_fullname_field_id() ];
 	} elseif ( $user_id ) {
 		$salutation = bp_core_get_user_displayname( $user_id );
diff --git src/bp-members/bp-members-functions.php src/bp-members/bp-members-functions.php
index 7cdcb7ec9..0bbe3d133 100644
--- src/bp-members/bp-members-functions.php
+++ src/bp-members/bp-members-functions.php
@@ -1776,7 +1776,7 @@ function bp_core_signup_user( $user_login, $user_password, $user_email, $usermet
 		 */
 		if ( apply_filters( 'bp_core_signup_send_activation_key', true, $user_id, $user_email, $activation_key, $usermeta ) ) {
 			$salutation = $user_login;
-			if ( isset( $usermeta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
+			if ( bp_is_active( 'xprofile' ) && isset( $usermeta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
 				$salutation = $usermeta[ 'field_' . bp_xprofile_fullname_field_id() ];
 			}
 
diff --git src/bp-members/classes/class-bp-signup.php src/bp-members/classes/class-bp-signup.php
index 57fe29124..339e00c2c 100644
--- src/bp-members/classes/class-bp-signup.php
+++ src/bp-members/classes/class-bp-signup.php
@@ -640,7 +640,7 @@ class BP_Signup {
 				// Send the validation email.
 				} else {
 					$salutation = $signup->user_login;
-					if ( isset( $meta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
+					if ( bp_is_active( 'xprofile' ) && isset( $meta[ 'field_' . bp_xprofile_fullname_field_id() ] ) ) {
 						$salutation = $meta[ 'field_' . bp_xprofile_fullname_field_id() ];
 					}