Endless runner browser build errors

i open the “endless runner” example with 2.80 (rc) and the latest armory
but when i build for the browser (chrome 76.0.3809.132 x64)
i get the following error in the console, continuously until the browser crashes:

20:15:14.979 kha.js:1320 kha/graphics4/PipelineState.hx:111: Warning: Sampler tex not found.
20:15:15.002 kha.js:24122 The AudioContext was not allowed to start. It must be resumed (or created) after a user gesture on the page. https://goo.gl/7K7WLu
kha_audio2_Audio.initContext @ kha.js:24122
20:15:18.750 kha.js:19734 Uncaught js__$Boot_HaxeError {val: “Cannot cast {↵ bezierFrameIndex : -1, ↵ s0 : 0, ↵ …0, 1), ↵ v1 : (0, 0, 0, 1), ↵ v2 : (0, 0, 0, 1)↵}”, stack: “Error: Cannot cast {↵ bezierFrameIndex : -1, ↵ s0 …t:8040/build_endless/debug/html5/kha.js:12336:26)”}
js_Boot.cast @ kha.js:19734
iron_object_Uniforms.setObjectConstant @ kha.js:18207
iron_object_Uniforms.setObjectConstants @ kha.js:15517
render @ kha.js:13779
submitDraw @ kha.js:3013
drawMeshes @ kha.js:2975
armory_renderpath_RenderPathDeferred.drawMeshes @ kha.js:914
armory_renderpath_RenderPathDeferred.commands @ kha.js:1002
renderFrame @ kha.js:2775
renderFrame @ kha.js:12336
renderFrame @ kha.js:3894
iron_App.render @ kha.js:2558
kha_System.render @ kha.js:22149
animate @ kha.js:22646
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624
20:15:19.147 kha.js:19734 Uncaught js
$Boot_HaxeError {val: “Cannot cast {↵ bezierFrameIndex : -1, ↵ s0 : 0, ↵ …0, 1), ↵ v1 : (0, 0, 0, 1), ↵ v2 : (0, 0, 0, 1)↵}”, stack: “Error: Cannot cast {↵ bezierFrameIndex : -1, ↵ s0 …t:8040/build_endless/debug/html5/kha.js:12336:26)”}
js_Boot.__cast @ kha.js:19734
iron_object_Uniforms.setObjectConstant @ kha.js:18207
iron_object_Uniforms.setObjectConstants @ kha.js:15517
render @ kha.js:13779
submitDraw @ kha.js:3013
drawMeshes @ kha.js:2975
armory_renderpath_RenderPathDeferred.drawMeshes @ kha.js:914
armory_renderpath_RenderPathDeferred.commands @ kha.js:1002
renderFrame @ kha.js:2775
renderFrame @ kha.js:12336
renderFrame @ kha.js:3894
iron_App.render @ kha.js:2558
kha_System.render @ kha.js:22149
animate @ kha.js:22646
requestAnimationFrame (async)
animate @ kha.js:22624
requestAnimationFrame (async)
animate @ kha.js:22624