diff --git a/wp-includes/link-template.php b/wp-includes/link-template.php
index 0e746becb0..be39e36279 100644
--- a/wp-includes/link-template.php
+++ b/wp-includes/link-template.php
@@ -1687,6 +1687,18 @@ function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previo
 	$where    = '';
 	$adjacent = $previous ? 'previous' : 'next';
 
+	if ( ! empty( $excluded_terms ) && ! is_array( $excluded_terms ) ) {
+		// back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
+		if ( false !== strpos( $excluded_terms, ' and ' ) ) {
+			_deprecated_argument( __FUNCTION__, '3.3.0', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
+			$excluded_terms = explode( ' and ', $excluded_terms );
+		} else {
+			$excluded_terms = explode( ',', $excluded_terms );
+		}
+
+		$excluded_terms = array_map( 'intval', $excluded_terms );
+	}
+
 	/**
 	 * Filters the IDs of terms excluded from adjacent post queries.
 	 *
@@ -1695,23 +1707,11 @@ function get_adjacent_post( $in_same_term = false, $excluded_terms = '', $previo
 	 *
 	 * @since 4.4.0
 	 *
-	 * @param string $excluded_terms Array of excluded term IDs.
+	 * @param array $excluded_terms Array of excluded term IDs.
 	 */
 	$excluded_terms = apply_filters( "get_{$adjacent}_post_excluded_terms", $excluded_terms );
 
 	if ( $in_same_term || ! empty( $excluded_terms ) ) {
-		if ( ! empty( $excluded_terms ) && ! is_array( $excluded_terms ) ) {
-			// back-compat, $excluded_terms used to be $excluded_terms with IDs separated by " and "
-			if ( false !== strpos( $excluded_terms, ' and ' ) ) {
-				_deprecated_argument( __FUNCTION__, '3.3.0', sprintf( __( 'Use commas instead of %s to separate excluded terms.' ), "'and'" ) );
-				$excluded_terms = explode( ' and ', $excluded_terms );
-			} else {
-				$excluded_terms = explode( ',', $excluded_terms );
-			}
-
-			$excluded_terms = array_map( 'intval', $excluded_terms );
-		}
-
 		if ( $in_same_term ) {
 			$join  .= " INNER JOIN $wpdb->term_relationships AS tr ON p.ID = tr.object_id INNER JOIN $wpdb->term_taxonomy tt ON tr.term_taxonomy_id = tt.term_taxonomy_id";
 			$where .= $wpdb->prepare( 'AND tt.taxonomy = %s', $taxonomy );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index a64a5ab56e..a0aca0a34c 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-beta1-44590';
+$wp_version = '5.1-beta1-44591';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.