I had a similar problem with this on Android. My "fix" was to ensure the popup passed the root page reference to the new popup, not use the modal page's page instance. This seemed to work fine from then on.

In fact, this is a limitation of the iOS. The developer will have to make sure that he has dismissed one modal page before showing another one. The master page on which you call .showModal has to be visible when you call it. In order to be visible in iOS, you would have to close the previous modal page with the supplied closeCallback. Since we can't really fix anything in our code, I am going to close this issue.

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a new issue for related bugs.