[Python] Scrapy Error during scraping - only when middleware is enabled

All info including error message , spider code , middleware code are inserted in the document pasted in the link below.

The code works perfectly when the middleware is disabled. Upon enabling the middleware it throws an error.

https://drive.google.com/file/d/1VW-jWKZ0yUG65RGcHNNpEfsJdwq1hpjh/view?usp=sharing

Using Scrapy==2.12.0 and Python 3.13.2

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