PHP 7.4 & TEXT: Trying to access array offset on value of type null

[ohno]

Not sure how to find what is causing my issue here, I'm running smarty which gives me this error if I switch PHP version to 7.4 (was on 7.3) : -

 

Quote

ERRNO: 8
TEXT: Trying to access array offset on value of type null
LOCATION: /home/mywebsite/public_html/smarty_templates_c/6c6d4758b747deced9729a6e51ecf350702d314f_0.file.cart.tpl.php, line 365, at May 27, 2020, 11:32 am
Showing backtrace:
content_5ecd2ac2aa0d30_10801785(Object:Smarty_Internal_Template) # line  123, file: /home/mywebsite/public_html/include/smarty/sysplugins/smarty_template_resource_base.php
Smarty_Template_Resource_Base.getRenderedTemplateCode(Object:Smarty_Internal_Template) # line  114, file: /home/mywebsite/public_html/include/smarty/sysplugins/smarty_template_compiled.php
Smarty_Template_Compiled.render(Object:Smarty_Internal_Template) # line  216, file: /home/mywebsite/public_html/include/smarty/sysplugins/smarty_internal_template.php
Smarty_Internal_Template.render(false, "1") # line  232, file: /home/mywebsite/public_html/include/smarty/sysplugins/smarty_internal_templatebase.php
Smarty_Internal_TemplateBase._execute(Object:Smarty_Internal_Template, null, null, null, "1") # line  134, file: /home/mywebsite/public_html/include/smarty/sysplugins/smarty_internal_templatebase.php
Smarty_Internal_TemplateBase.display("pages/cart.tpl") # line  106, file: /home/mywebsite/public_html/cart/index.php

The line the error refers to is this : -

 

<p class="cart_del_info_box_text"><i class="fa fa-exclamation-triangle" aria-hidden="true"></i> <span class="cart_del_info_box_message"><?php echo $_smarty_tpl->tpl_vars['cart']->value->mDelivery['cartdeliverymessage'];?>

 

How do I go about finding which file has the actual problem? Thanks for any pointers.

[kicken]

The issue is that either tpl_vars is null or mDelivery is null. 

Check that when using that template you're defining the cart variable.   Check that it's mDelivery property is is an array.

[ohno]

Thanks, fixed that issue now the payment page has a whole load of similar errors!

<input <?php if (isset($_smarty_tpl->tpl_vars['cart']->value->mErrors['BillingFirstName'])) {?>class="error"<?php }?> type="text" name="BillingFirstName" tabindex="8" maxlength="25" value="<?php echo $_smarty_tpl->tpl_vars['cart']->value->mVars['BillingFirstName'];?>

 

Stuck on this one TBH!