error

• Warning: Undefined array key 0 in onb2023_preprocess_node() (line 288 of themes/custom/onb2023/onb2023.theme).
• Warning: Trying to access array offset on value of type null in onb2023_preprocess_node() (line 288 of themes/custom/onb2023/onb2023.theme).
• Warning: Undefined array key 0 in onb2023_preprocess_node() (line 289 of themes/custom/onb2023/onb2023.theme).
• Warning: Trying to access array offset on value of type null in onb2023_preprocess_node() (line 289 of themes/custom/onb2023/onb2023.theme).