錯誤信息

• Notice: Undefined variable: prev_title in xuanchuanpian_links_node_links_alter() (line 99 of modules/custom/xuanchuanpian_links/xuanchuanpian_links.module).
• Notice: Trying to get property 'title' of non-object in xuanchuanpian_links_node_links_alter() (line 99 of modules/custom/xuanchuanpian_links/xuanchuanpian_links.module).
• Notice: Undefined variable: next_title in xuanchuanpian_links_node_links_alter() (line 114 of modules/custom/xuanchuanpian_links/xuanchuanpian_links.module).
• Notice: Trying to get property 'title' of non-object in xuanchuanpian_links_node_links_alter() (line 114 of modules/custom/xuanchuanpian_links/xuanchuanpian_links.module).