setPaintProperty(layerId, '[icon|text]-opacity', ...) will raise on a undefined uniformName

mapbox-gl-js version: 0.50.0

browser: Chrome Version 69.0.3497.100

Context

Map with several layers (symbols and texts).

setPaintProperty(layerId, '[icon|text]-opacity', ...) on multiple layers will sometimes raise the following error:

Uncaught TypeError: Cannot read property 'set' of undefined
    at SourceExpressionBinder.setUniforms (mapbox-gl-dev.js:16727)
    at ProgramConfiguration.setUniforms (mapbox-gl-dev.js:17332)
    at Program.draw (mapbox-gl-dev.js:53626)
    at drawSymbolElements (mapbox-gl-dev.js:55164)
    at drawLayerSymbols (mapbox-gl-dev.js:55139)
    at Object.drawSymbols [as symbol] (mapbox-gl-dev.js:54913)
    at Painter.renderLayer (mapbox-gl-dev.js:59165)
    at Painter.render (mapbox-gl-dev.js:59121)
    at Map._render (mapbox-gl-dev.js:65617)
    at mapbox-gl-dev.js:65725


setUniforms           @ mapbox-gl-dev.js:16727
setUniforms           @ mapbox-gl-dev.js:17332
draw                  @ mapbox-gl-dev.js:53626
drawSymbolElements    @ mapbox-gl-dev.js:55164
drawLayerSymbols      @ mapbox-gl-dev.js:55139
drawSymbols           @ mapbox-gl-dev.js:54913
renderLayer           @ mapbox-gl-dev.js:59165
render                @ mapbox-gl-dev.js:59121
_render               @ mapbox-gl-dev.js:65617
(anonymous)           @ mapbox-gl-dev.js:65725
requestAnimationFrame (async)
frame                 @ mapbox-gl-dev.js:2468
triggerRepaint        @ mapbox-gl-dev.js:65723
_render               @ mapbox-gl-dev.js:65654
(anonymous)           @ mapbox-gl-dev.js:65725
requestAnimationFrame (async)
frame                 @ mapbox-gl-dev.js:2468
triggerRepaint        @ mapbox-gl-dev.js:65723
_render               @ mapbox-gl-dev.js:65654
(anonymous)           @ mapbox-gl-dev.js:65725
requestAnimationFrame (async)
frame                 @ mapbox-gl-dev.js:2468
triggerRepaint        @ mapbox-gl-dev.js:65723
_update               @ mapbox-gl-dev.js:65532
(anonymous)           @ mapbox-gl-dev.js:64168
fire                  @ mapbox-gl-dev.js:2853
fire                  @ mapbox-gl-dev.js:2879
update                @ mapbox-gl-dev.js:51758
_render               @ mapbox-gl-dev.js:65596
(anonymous)           @ mapbox-gl-dev.js:65725
requestAnimationFrame (async)
frame                 @ mapbox-gl-dev.js:2468
triggerRepaint        @ mapbox-gl-dev.js:65723
_update               @ mapbox-gl-dev.js:65532
setPaintProperty      @ mapbox-gl-dev.js:65220

Start at SourceExpressionBinder.setUniforms and ProgramConfiguration.setUniforms, reached from setPaintProperty through symbol rendering; use the reported opacity updates across multiple symbol and text layers as the reproduction. Done means the sequence no longer raises “Cannot read property 'set' of undefined” during rendering.