diff --git a/lib/class-wp-theme-json-gutenberg.php b/lib/class-wp-theme-json-gutenberg.php
index d949fbef987a02..ef44519859197c 100644
--- a/lib/class-wp-theme-json-gutenberg.php
+++ b/lib/class-wp-theme-json-gutenberg.php
@@ -697,7 +697,10 @@ private static function get_settings_values_by_slug( $settings, $preset_metadata
 				if ( isset( $preset_metadata['value_key'] ) ) {
 					$value_key = $preset_metadata['value_key'];
 					$value     = $preset[ $value_key ];
-				} elseif ( is_callable( $preset_metadata['value_func'] ) ) {
+				} elseif (
+					isset( $preset_metadata['value_func'] ) &&
+					is_callable( $preset_metadata['value_func'] )
+				) {
 					$value_func = $preset_metadata['value_func'];
 					$value      = call_user_func( $value_func, $preset );
 				} else {
@@ -1307,7 +1310,16 @@ private static function remove_insecure_settings( $input ) {
 					esc_attr( esc_html( $preset['name'] ) ) === $preset['name'] &&
 					sanitize_html_class( $preset['slug'] ) === $preset['slug']
 				) {
-					$value           = $preset[ $preset_metadata['value_key'] ];
+					$value = null;
+					if ( isset( $preset_metadata['value_key'] ) ) {
+						$value = $preset[ $preset_metadata['value_key'] ];
+					} elseif (
+						isset( $preset_metadata['value_func'] ) &&
+						is_callable( $preset_metadata['value_func'] )
+					) {
+						$value = call_user_func( $preset_metadata['value_func'], $preset );
+					}
+
 					$preset_is_valid = true;
 					foreach ( $preset_metadata['properties'] as $property ) {
 						if ( ! self::is_safe_css_declaration( $property, $value ) ) {