Can't access Mega Menu Pro configuration : Invalid $number parameter: "" cannot be interpreted as a number

[matheo_ps]

When I click "configuration" on Mega Menu Pro plugin in the back office, I get this error (see attached files)

PS v1.7.8.9  PHP v7.2.34

I think it's because of these 2 products with a 0€ price, but when i go to products in the back office, they have a price !
I tried the solution in this topic but didnt worked for me : 

If you have any questions, I will answer them as quickly as possible.

Thanks in advance !

Edited February 15 by matheo_ps
didnt want to upload first (miss click) (see edit history)

[matheo_ps]

I found the solution in the topic : 
https://www.webempresa.com/foro/preguntas-sobre-prestashop/error-invalid-number-paramete

adding this line of code

if ( $number === null ) return null;

in line 152 of the file src/Core/Localization/Locale.php