"Bad canvas size at init." error on iOS device

I'm trying to make an Ironsource playable ad but when I use their test app to load my playable I have the error "Bad canvas size at init". The error is only on iOS, the playable works fine on a mac/computer browser and on an android device. Does someone know how I can make it work on iOS ? (By the way the error is only present if I build with "Auto resize frame".

 

If anyone has the problem: In some case the function that sets the size of the canvas (HTML.cs in the Project Tiny for Web) may be call too early. When that happened the frame width & height of the DisplayInfo struct are 0. And when you have Auto Resize Frame enabled the function will try to set the canvas size to (0,0). To fix the issue I copied the function in HTML.cs and modify it so it waits until the frame size is not (0,0) before resizing the canvas.