fix: add additional checks

Author: Arukuen

src/plugins/global-settings/preset-controls/index.php

@@ -87,29 +87,30 @@ public function use_size_presets_by_default_set_default( $old_version, $new_vers
 		 * @since 3.16.0
 		 */
 		public function migrate_global_typography_font_size( $old_version, $new_version ) {
-			if ( ! empty( $old_version ) && version_compare( $old_version, "3.16.0", "<" )
-				&& ! empty( $typography_option ) && isset( $typography_option[ 0 ] )
-			) {
+			if ( ! empty( $old_version ) && version_compare( $old_version, "3.16.0", "<" ) ) {
 				$typography_option = get_option( 'stackable_global_typography' );
-				$typography = $typography_option[ 0 ];
-				$updated = false;
 
-				foreach ( $typography as $key => $item ) {
-					if ( ! is_array( $item ) ) {
-						continue;
-					}
+				if ( ! empty( $typography_option ) && isset( $typography_option[ 0 ] ) && is_array( $typography_option[ 0 ] ) ) {
+					$typography = $typography_option[ 0 ];
+					$updated = false;
+
+					foreach ( $typography as $key => $item ) {
+						if ( ! is_array( $item ) ) {
+							continue;
+						}
 
-					foreach ( [ 'fontSize', 'tabletFontSize', 'mobileFontSize' ] as $size_key ) {
-						if ( isset( $item[ $size_key ] ) && is_numeric( $item[ $size_key ] ) ) {
-							$typography[ $key ][ $size_key ] = strval( $item[ $size_key ] );
-							$updated = true;
+						foreach ( [ 'fontSize', 'tabletFontSize', 'mobileFontSize' ] as $size_key ) {
+							if ( isset( $item[ $size_key ] ) && is_numeric( $item[ $size_key ] ) ) {
+								$typography[ $key ][ $size_key ] = strval( $item[ $size_key ] );
+								$updated = true;
+							}
 						}
 					}
-				}
 
-				if ( $updated ) {
-					$typography_option[ 0 ] = $typography;
-					update_option( 'stackable_global_typography', $typography_option );
+					if ( $updated ) {
+						$typography_option[ 0 ] = $typography;
+						update_option( 'stackable_global_typography', $typography_option );
+					}
 				}
 			}
 		}