Block error message in foreach loop when looping through ACF field

For those who are looking for an answer – after trial and error i found the “if” statement i was looking for. Full code as follows:

    
    $variablename = get_field('dcfg_global_item_select');

        if ( !empty( $variablename ) ) {?>

            <div class="container">

                <?php foreach($variablename as $variablename2):?>

                        <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                            <center>
                            <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                            </center>
                        </a>

                <?php endforeach;
                                       }?>
        
        <?php $variablename = get_field('dchdl_global_item_select');
    
            if ( !empty( $variablename ) ) {?>
                
                <div class="container">
        
                    <?php foreach($variablename as $variablename2):?>
        
                        <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                            <center>
                            <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                            </center>
                        </a>

                    <?php endforeach;
                                            }?>
        
        <?php $variablename = get_field('dcstd_global_item_select');
    
            if ( !empty( $variablename ) ) {?>
                    
                <div class="container">
        
                    <?php foreach($variablename as $variablename2):?>

                            <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                                <center>
                                <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                                </center>
                            </a>

                    <?php endforeach;
                                           }?>
        
        <?php $variablename = get_field('dcthdl_global_item_select');
    
            if ( !empty( $variablename ) ) {?>

                <div class="container">

                    <?php foreach($variablename as $variablename2):?>

                            <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                                <center>
                                <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                                </center>
                            </a>

                    <?php endforeach;
                                           }?>
        
        <?php $variablename = get_field('drcfg_global_item_select');
    
            if ( !empty( $variablename ) ) {?>
                    
                <div class="container">
        
                    <?php foreach($variablename as $variablename2):?>

                            <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                                <center>
                                <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                                </center>
                            </a>

                    <?php endforeach;
                                           }?>
        
        <?php $variablename = get_field('drchdl_global_item_select');
    
            if ( !empty( $variablename ) ) {?>
                    
                <div class="container">
        
                    <?php foreach($variablename as $variablename2):?>

                            <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                                <center>
                                <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                                </center>
                            </a>

                    <?php endforeach;
                                           }?>
        
        <?php $variablename = get_field('drcstd_global_item_select');
    
            if ( !empty( $variablename ) ) {?>
                    
                <div class="container">
        
                    <?php foreach($variablename as $variablename2):?>

                            <a href="<?php echo get_page_link($variablename2 ->ID);?>">
                                <center>
                                <img src="<?php echo get_the_post_thumbnail_url($variablename2->ID, 'medium');?>">
                                </center>
                            </a>

                    <?php endforeach;
                                           }?>


    </div>

<?php }?>

<?php add_shortcode('show_global_pics_in_personal', 'show_global_pics_in_personal_library');