diff --git a/includes/class-kadence-blocks-css.php b/includes/class-kadence-blocks-css.php
index 24fefb91b..9a5cdb3f6 100644
--- a/includes/class-kadence-blocks-css.php
+++ b/includes/class-kadence-blocks-css.php
@@ -1393,7 +1393,12 @@ public function render_row_gap_property( $attributes, $name = array( 'gap', 'tab
 				$attributes[ $name[2] ] = $attributes[ $name[1] ];
 			}
 			if ( $attributes[ $name[1] ] === 'custom' && empty( $attributes[ $custom ][1] ) ) {
-				$attributes[ $custom ][1] = $attributes[ $custom ][0];
+				if (isset($attributes[$custom][0])) {
+					$attributes[$custom][1] = $attributes[$custom][0];
+				} else {
+					// Handle the scenario where $attributes[$custom][0] is not set.
+					$attributes[$custom][1] = ''; // Default empty string.
+				}
 			}
 			if ( $attributes[ $name[2] ] === 'custom' && empty( $attributes[ $custom ][2] ) ) {
 				$attributes[ $custom ][2] = $attributes[ $custom ][1];