GraphQl products query returns error: Warning: Array to string conversion in vendor/magento/module-catalog-graph-ql/Model/Resolver/Product/ProductCustomAttributes.php on line 111

[mrrobotisback]

Preconditions and environment

Preconditions and environment
Magento version 2.4.7-p4
OpenSearch search engine configured and used by Magento

Steps to reproduce

1. Install vanilla Magento

2. create Size attribute DropDown attribute with code size and options: xs, s, m, l, xl, xxl and Values Required: No

3. Set attribute parameters

   • Use in Search: Yes
   • Use in Layered Navigation: Filterable (with results)
   • Use in Search Results Layered Navigation: Yes
   • Visible on Catalog Pages on Storefront: Yes
   • Used in Product Listing: Yes
   • Add attribute test_ddl to default Attribute set

4. On existing color attribute add option: red, green, black

5. Create new configurable product in admin with SKU test

   • name: Test
   • sku: test
   • price: 0

6. Save configurable product

7. Crea new Simple product in admin with SKU test-simple

   • name: test-simple
   • sku: test-simple
   • price: 55
   • tier price: all websites, all groups, 50, fixed, 45
   • quantity: 100
   • stock status: in stock
   • color: red
   • size: xs

8. Save simple product

9. reopen configurable product

   • link simple to configurable by color and size
   • save
   • set stock status: in stock
   • save

10. run indexer:reindex , ca:cl, ca:fl

11. make GraphQL query:

    products(filter: { url_key: { eq: "test" } }) {
        total_count
        items {
            canonical_url
            color
					  size
            manufacturer
            meta_description
            meta_keyword
            meta_title
            name
            new_from_date
            new_to_date
            only_x_left_in_stock
            options_container
            rating_summary
            review_count
            sku
            special_from_date
            special_price
            special_to_date
            stock_status
            swatch_image
            tier_price
            type_id
            uid
            updated_at
            url_key
            url_path
            url_suffix
            description {
                html
            }
            ... on ConfigurableProduct {
                variants {
                    product {
                        color
											  size
                        only_x_left_in_stock
                        sku
                        stock_status
                        custom_attributesV2 {
                            items {
                                code
                                ... on AttributeValue {
                                    code
                                    value
                                }
                                ... on AttributeSelectedOptions {
                                    code
                                }
                            }
                        }
                    }
                    attributes {
                        code
                        label
                    }
                }
            }
            custom_attributesV2 {
                items {
                    code
                    ... on AttributeValue {
                        code
                        value
                    }
                }
            }
        }
    }
}

Expected result

There is list of products with the test product in it.
There is no error

Actual result

{
	"errors": [
		{
			"message": "Internal server error",
			"locations": [
				{
					"line": 62,
					"column": 13
				}
			],
			"path": [
				"products",
				"items",
				0,
				"custom_attributesV2"
			],
			"extensions": {
				"debugMessage": "Magento\\EavGraphQl\\Model\\Output\\Value\\GetAttributeValueComposite::execute(): Argument #3 ($value) must be of type string, null given, called in \/var\/www\/html\/magento\/vendor\/magento\/module-catalog-graph-ql\/Model\/Resolver\/Product\/ProductCustomAttributes.php on line 122"
			}
		},
		{
			"message": "Internal server error",
			"locations": [
				{
					"line": 43,
					"column": 25
				}
			],
			"path": [
				"products",
				"items",
				0,
				"variants",
				0,
				"product",
				"custom_attributesV2"
			],
			"extensions": {
				"debugMessage": "Warning: Array to string conversion in \/var\/www\/html\/magento\/vendor\/magento\/module-catalog-graph-ql\/Model\/Resolver\/Product\/ProductCustomAttributes.php on line 111"
			}
		}
	],
	"data": {
		"products": {
			"total_count": 1,
			"items": [
				{
					"canonical_url": null,
					"color": null,
					"size": null,
					"manufacturer": null,
					"meta_description": "Test",
					"meta_keyword": "Test",
					"meta_title": "Test",
					"name": "Test",
					"new_from_date": null,
					"new_to_date": null,
					"only_x_left_in_stock": null,
					"options_container": "container2",
					"rating_summary": 0,
					"review_count": 0,
					"sku": "Test",
					"special_from_date": null,
					"special_price": null,
					"special_to_date": null,
					"stock_status": "IN_STOCK",
					"swatch_image": null,
					"tier_price": null,
					"type_id": "configurable",
					"uid": "MQ==",
					"updated_at": "2025-05-13 12:36:02",
					"url_key": "test",
					"url_path": null,
					"url_suffix": ".html",
					"description": {
						"html": ""
					},
					"variants": [
						{
							"product": {
								"color": 10,
								"size": 4,
								"only_x_left_in_stock": null,
								"sku": "test-simple",
								"stock_status": "IN_STOCK",
								"custom_attributesV2": null
							},
							"attributes": [
								{
									"code": "color",
									"label": "red"
								},
								{
									"code": "size",
									"label": "xs"
								}
							]
						}
					],
					"custom_attributesV2": null
				}
			]
		}
	}
}

Additional information

After apply this patch -> #38884 (comment)
I still have this error:

{
	"errors": [
		{
			"message": "Internal server error",
			"locations": [
				{
					"line": 43,
					"column": 25
				}
			],
			"path": [
				"products",
				"items",
				0,
				"variants",
				0,
				"product",
				"custom_attributesV2"
			],
			"extensions": {
				"debugMessage": "Warning: Array to string conversion in \/var\/www\/html\/magento\/vendor\/magento\/module-catalog-graph-ql\/Model\/Resolver\/Product\/ProductCustomAttributes.php on line 111"
			}
		}
	],
	"data": {
		"products": {
			"total_count": 1,
			"items": [
				{
					"canonical_url": null,
					"color": null,
					"size": null,
					"manufacturer": null,
					"meta_description": "Test",
					"meta_keyword": "Test",
					"meta_title": "Test",
					"name": "Test",
					"new_from_date": null,
					"new_to_date": null,
					"only_x_left_in_stock": null,
					"options_container": "container2",
					"rating_summary": 0,
					"review_count": 0,
					"sku": "Test",
					"special_from_date": null,
					"special_price": null,
					"special_to_date": null,
					"stock_status": "IN_STOCK",
					"swatch_image": null,
					"tier_price": null,
					"type_id": "configurable",
					"uid": "MQ==",
					"updated_at": "2025-05-13 12:36:02",
					"url_key": "test",
					"url_path": null,
					"url_suffix": ".html",
					"description": {
						"html": ""
					},
					"variants": [
						{
							"product": {
								"color": 10,
								"size": 4,
								"only_x_left_in_stock": null,
								"sku": "test-simple",
								"stock_status": "IN_STOCK",
								"custom_attributesV2": null
							},
							"attributes": [
								{
									"code": "color",
									"label": "red"
								},
								{
									"code": "size",
									"label": "xs"
								}
							]
						}
					],
					"custom_attributesV2": {
						"items": [
							{
								"code": "name",
								"value": "Test"
							},
							{
								"code": "manufacturer"
							},
							{
								"code": "meta_title",
								"value": "Test"
							},
							{
								"code": "meta_keyword",
								"value": "Test"
							},
							{
								"code": "meta_description",
								"value": "Test"
							},
							{
								"code": "status"
							},
							{
								"code": "visibility"
							},
							{
								"code": "page_layout"
							},
							{
								"code": "options_container"
							},
							{
								"code": "url_key",
								"value": "test"
							},
							{
								"code": "msrp_display_actual_price_type"
							},
							{
								"code": "gift_message_available"
							},
							{
								"code": "tax_class_id"
							}
						]
					}
				}
			]
		}
	}
}

because on this line 2.4.7-p4
vendor/magento/module-catalog-graph-ql/Model/Resolver/Product/ProductCustomAttributes.php:111
when evaluate tier_prices is an array of array.

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant]

Hi @mrrobotisback. Thank you for your report.
To speed up processing of this issue, make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce.

• For more details, review the Magento Contributor Assistant documentation.
• Add a comment to assign the issue: @magento I am working on this
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[m2-assistant]

Hi @engcom-November. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).
• 2. Verify that issue has a meaningful description and provides enough information to reproduce the issue.
• 3. Add Area: XXXXX label to the ticket, indicating the functional areas it may be related to.
• 4. Verify that the issue is reproducible on 2.4-develop branch
  Details

  - If the issue is reproducible on 2.4-develop branch, please, add the label Reproduced on 2.4.x.
  - If the issue is not reproducible, add your comment that issue is not reproducible and close the issue and stop verification process here!
• 5. Add label Issue: Confirmed once verification is complete.
• 6. Make sure that automatic system confirms that report has been added to the backlog.

[tuyennn]

@magento give me 2.4-develop instance

[engcom-November]

Hello @mrrobotisback ,

Thank you for your report and collaboration.

We attempted to reproduce the issue in our latest version 2.4 develop but were unable to reproduce it. Please find the attached screenshot for reference.

Steps to Reproduce:

• Install vanilla Magento
• create Size attribute DropDown attribute with code size and options: xs, s, m, l, xl, xxl and Values Required: No
• Set attribute parameters
• Use in Search: Yes
• Use in Layered Navigation: Filterable (with results)
• Use in Search Results Layered Navigation: Yes
• Visible on Catalog Pages on Storefront: Yes
• Used in Product Listing: Yes
• Add attribute test_ddl to default Attribute set
• On existing color attribute add option: red, green, black
• Create new configurable product in admin with SKU test
• name: Test
• sku: test
• price: 0
• Save configurable product
• Create new Simple product in admin with SKU test-simple
• name: test-simple
• sku: test-simple
• price: 55
• tier price: all websites, all groups, 50, fixed, 45
• quantity: 100
• stock status: in stock
• color: red
• size: XS
• Save simple product
• reopen configurable product
• link simple to configurable by color and size
• save
• set stock status: in stock
• save
• run indexer:reindex , ca:cl, ca:fl
• make GraphQL query:

`
products(filter: { url_key: { eq: "test" } }) {
total_count
items {
canonical_url
color
size
manufacturer
meta_description
meta_keyword
meta_title
name
new_from_date
new_to_date
only_x_left_in_stock
options_container
rating_summary
review_count
sku
special_from_date
special_price
special_to_date
stock_status
swatch_image
tier_price
type_id
uid
updated_at
url_key
url_path
url_suffix
description {
html
}
... on ConfigurableProduct {
variants {
product {
color
size
only_x_left_in_stock
sku
stock_status
custom_attributesV2 {
items {
code
... on AttributeValue {
code
value
}
... on AttributeSelectedOptions {
code
}
}
}
}
attributes {
code
label
}
}
}
custom_attributesV2 {
items {
code
... on AttributeValue {
code
value
}
}
}
}
}
}

`

We followed the preconditions and steps as provided and did not encounter any issues. Could you please recheck in the latest version of Magento and let us know if we are missing any steps to reproduce this issue?

Therefore, we are marking this ticket as "Issue: Needs Update".

Thank you!

[mrrobotisback]

Hi , magento version used is 2.4.7-p4 have you test with this version ? i haven't a local environment ready for 2.4.8 sorry. can you try with 2.4.7-p4 ?

thanks in advance.

[engcom-November]

Hello @mrrobotisback ,

We recommend testing with the latest 2.4 development version, as the issue could not be replicated there. It appears the issue may have been resolved in the latest build.

Thank you!