javascript - Suppress Safari can't open the page because the address is invalid? custom app launch -

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i'm launching custom app web browser on iphone.

if app not installed redirecting web page on website.

if installed goes specific page on app

this works expected except 1/2 second safari displays modal window saying following

cannot open page safari cannot open page because address invalid.

i know address invalid , know if possible suppress error message in safari.

thanks

i did find solution worked this. had working settimeout of 25ms. reason on nexus 5 needed drop down 5ms.

i ended using following:

    function gotoapp(applocation, fallbacklocation) {          settimeout(function() {             window.location = fallbacklocation;              }, 5);        window.location = "nativeappurl://" + applocation;     }      function gotoweb(baseurl, weblocation) {         window.location =baseurl + "/"+ weblocation;     } </script>

then have 2 buttons have 

 onclick="gotoapp('appdestination', 'location')"

and 

 onclick="gotoweb('webdestination', 'location')"

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