Unexpected whitespace in path

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Getting a Fatal error related to unexpected whitespace:

Fatal error: Uncaught Dotenv\Exception\InvalidFileException: Failed to parse dotenv file. Encountered unexpected whitespace at [localhost:"/Users/example/Library/Application Support/.../mysqld.sock"]. in ~/vendor/vlucas/phpdotenv/src/Parser/Parser.php:30

Not sure what is unexpected about double quoted whitespace