ignore touch events that do not correspond to a tracked touch; fixes BananaBread crashes

1 files changed, 1 insertions, 0 deletions

diff --git a/src/library_sdl.js b/src/library_sdl.js
index 077f72eb..d5b2b354 100644
--- a/src/library_sdl.js
+++ b/src/library_sdl.js
@@ -789,6 +789,7 @@ var LibrarySDL = {
         }
         case 'touchstart': case 'touchend': case 'touchmove': {
           var touch = event.touch;
+          if (!Browser.touches[touch.identifier]) break;
           var w = Module['canvas'].width;
           var h = Module['canvas'].height;
           var x = Browser.touches[touch.identifier].x / w;