Migrating from Opencart

I am about to start a new project migrating a site from Opencart. In the documents it says "The data from OpenCart, RedShop and MijoShop can also be imported automatically into HikaShop. You'll find one selection for each shopping cart system and it will be active only if the shopping cart tables are detected in the database."
Does that mean I have to install Joomla on the existing Opencart database for this function to work?

Hi Nicholas,
I just attempted the import and get this error:
Attempt to assign property "main_currency" on null

I have tried with the setting "Do you want to import your Opencart currencies rates ?" set to both Yes and No and get the same result. This is opencart version 2.1.0.2

Is this a Hikashop setting or an Opencart setting that I need to fix?

Thanks Philip,
I have set error reporting to maximum and debug on. I have also set logging to "almost everything". The error logs remain empty and the screen shot is here.

Thanks Philip,
I just took the code snippet in openc.php (around line 261 to 271) and asked Chatgpt what it did. I then took the output array of the $result that the code was trying to process and gave it to chatgpt as well as the error and asked what was wrong.

ChatGPT responded
"The error message "Attempt to assign property 'main_currency' on null" suggests that $this->options is not initialized before this code is executed. If $this->options is null, attempting to assign $this->options->$nk will cause this error."
and gave me this code to add at line 259

if (!is_object($this->options)) {
$this->options = new stdClass();
}

This has resolved the problem. Holy crap, we are all going to be out of work soon!!!

Glad it was resolved.