PHP Warning: Trying to access array offset on value of type bool in template-tag

Hello,

So I have this php warning:

[STDERR] PHP Warning:  Attempt to read property "post_content" on null in /home/***/domains/***/public_html/wp-content/themes/electro/inc/woocommerce/template-tags.php on line 1311\n
[STDERR] PHP Warning:  Trying to access array offset on value of type bool in /home/***/domains/***/public_html/wp-content/themes/electro/inc/woocommerce/template-tags.php on line 1315\n
[STDERR] PHP Warning:  Trying to access array offset on value of type bool in /home/***/domains/***/public_html/wp-content/themes/electro/inc/woocommerce/template-tags.php on line 1316\n
[STDERR] PHP Warning:  Trying to access array offset on value of type bool in /home/***/domains/***/public_html/wp-content/themes/electro/inc/woocommerce/template-tags.php on line 1317\n
[STDERR] PHP Warning:  Trying to access array offset on value of type bool in /home/***/domains/***/public_html/wp-content/themes/electro/inc/woocommerce/template-tags.php on line 1320\n

It is about this code:

<div id="<?php echo esc_attr( $wrapper_id ); ?>" class="<?php echo esc_attr( implode( ' ', array_map( 'sanitize_html_class', $wrapper_classes ) ) ); ?>" data-columns="<?php echo esc_attr( $columns ); ?>">
			<figure class="electro-wc-product-gallery__wrapper">
				<?php
				$attributes = array(
					'title'                   => $image_title,
					'data-large-image'        => $full_size_image[0],
					'data-large-image-width'  => $full_size_image[1],
					'data-large-image-height' => $full_size_image[2],
				);

				if ( has_post_thumbnail() ) {
					$html  = '<figure data-thumb="' . get_the_post_thumbnail_url( $post_id, 'shop_thumbnail' ) . '" class="electro-wc-product-gallery__image"><a href="' . esc_url( $full_size_image[0] ) . '">';
					$html .= get_the_post_thumbnail( $post_id, 'shop_thumbnail', $attributes );
					$html .= '</a></figure>';
				} else {
					$html  = '<figure class="electro-wc-product-gallery__image--placeholder">';
					$html .= sprintf( '<img src="%s" alt="%s" class="wp-post-image" />', esc_url( wc_placeholder_img_src() ), esc_html__( 'Awaiting product image', 'electro' ) );
					$html .= '</figure>';
				}

				echo apply_filters( 'electro_wc_single_product_image_thumbnail_html', $html, get_post_thumbnail_id( $post_id ) );

				if ( $attachment_ids ) {
					foreach ( $attachment_ids as $attachment_id ) {
						$full_size_image  = wp_get_attachment_image_src( $attachment_id, 'full' );
						$thumbnail        = wp_get_attachment_image_src( $attachment_id, 'shop_thumbnail' );
						$thumbnail_post   = get_post( $attachment_id );
						$image_title      = $thumbnail_post->post_content;

						$attributes = array(
							'title'                   => $image_title,
							'data-large-image'        => $full_size_image[0],
							'data-large-image-width'  => $full_size_image[1],
							'data-large-image-height' => $full_size_image[2],
						);

						$html  = '<figure data-thumb="' . esc_url( $thumbnail[0] ) . '" class="electro-wc-product-gallery__image"><a href="' . esc_url( $full_size_image[0] ) . '">';
						$html .= wp_get_attachment_image( $attachment_id, 'shop_thumbnail', false, $attributes );
				 		$html .= '</a></figure>';

						echo apply_filters( 'woocommerce_single_product_image_thumbnail_html', $html, $attachment_id );
					}
				}
				?>

These codes precisely:

1311: $image_title      = $thumbnail_post->post_content;
1315: 'data-large-image'        => $full_size_image[0],
1316: 'data-large-image-width'  => $full_size_image[1],
1317: 'data-large-image-height' => $full_size_image[2],
1320: $html  = '<figure data-thumb="' . esc_url( $thumbnail[0] ) . '" class="electro-wc-product-gallery__image"><a href="' . esc_url( $full_size_image[0] ) . '">';

I know it is in the theme, but the theme makers are not helping me…
So, I need to solve this myself… Can anyone explain to me what the warning means exactly and maybe point me in the right direction to solve this?
I would be very grateful!

• This topic was modified 1 year, 4 months ago by SLV.