Swiper slider "Cannot read properties of undefined (reading 'length')" when viewing within mobile view

[willmero]

• Framework7 version: 8
• Platform and Target: mobile browser
• Live Link or CodeSandbox/CodeSandbox: https://framework7.io/kitchen-sink/svelte/dist/?theme=ios

Describe the bug

When swiping on the swipers within the Kitchen-sink I'm seeing a number of errors in the console for "Cannot read properties of undefined (reading 'length')'"

To Reproduce

1. Visit the following kitchen-sink link in Chrome: https://framework7.io/kitchen-sink/svelte/dist/?theme=ios
2. Open up the dev tools and select the "Toggle device toolbar" button in the top left corner of dev tools to see the website in a mobile setting
3. Refresh the page to ensure you have the mobile version running
4. Look at the console, and try swiping on the swipers

Expected behavior

No errors in the console. Functionality seems to still work at a first glance, but wondering what other effects this will have later on.

Actual Behavior

Multiple errors in the console

Screenshots

[Ada-lave]

Hi, can u say how you fix that