diff --git a/includes/core/class-access.php b/includes/core/class-access.php
index ac36a846..67372e11 100644
--- a/includes/core/class-access.php
+++ b/includes/core/class-access.php
@@ -1196,7 +1196,7 @@ if ( ! class_exists( 'um\core\Access' ) ) {
 							if ( $block['attrs']['um_message_type'] == '1' ) {
 								$block_content = $default_message;
 							} elseif ( $block['attrs']['um_message_type'] == '2' ) {
-								$block_content = sanitize_textarea_field( $block['attrs']['um_message_content'] );
+								$block_content = isset( $block['attrs']['um_message_content'] ) ? sanitize_textarea_field( $block['attrs']['um_message_content'] ) : '';
 							}
 						}
 					} else {
@@ -1220,7 +1220,7 @@ if ( ! class_exists( 'um\core\Access' ) ) {
 								if ( $block['attrs']['um_message_type'] == '1' ) {
 									$block_content = $default_message;
 								} elseif ( $block['attrs']['um_message_type'] == '2' ) {
-									$block_content = sanitize_textarea_field( $block['attrs']['um_message_content'] );
+									$block_content = isset( $block['attrs']['um_message_content'] ) ? sanitize_textarea_field( $block['attrs']['um_message_content'] ) : '';
 								}
 							}
 						}
@@ -1234,7 +1234,7 @@ if ( ! class_exists( 'um\core\Access' ) ) {
 							if ( $block['attrs']['um_message_type'] == '1' ) {
 								$block_content = $default_message;
 							} elseif ( $block['attrs']['um_message_type'] == '2' ) {
-								$block_content = sanitize_textarea_field( $block['attrs']['um_message_content'] );
+								$block_content = isset( $block['attrs']['um_message_content'] ) ? sanitize_textarea_field( $block['attrs']['um_message_content'] ) : '';
 							}
 						}
 					}