Generating longer audiograms error

[foxy123]

I know that it's not maintained but still hope that someone might still look in it.
I am trying to generate a longer audiogram for YouTube. The first one I tried was actually successful. But now I keep getting an error.

SyntaxError: Unexpected end of JSON input
at JSON.parse ()
at load (/home/foxy/Downloads/Audiogram/WNYC/audiogram/lib/transports/redis/fake.js:14:15)
at getJobList (/home/foxy/Downloads/Audiogram/WNYC/audiogram/lib/transports/redis/fake.js:65:19)
at start (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/d3-queue/build/d3-queue.js:74:11)
at poke (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/d3-queue/build/d3-queue.js:58:11)
at Queue.defer (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/d3-queue/build/d3-queue.js:33:5)
at module.exports (/home/foxy/Downloads/Audiogram/WNYC/audiogram/server/status.js:7:6)
at Layer.handle [as handle_request] (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/express/lib/router/layer.js:95:5)
at next (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/express/lib/router/route.js:137:13)
at Route.dispatch (/home/foxy/Downloads/Audiogram/WNYC/audiogram/node_modules/express/lib/router/route.js:112:3)

I have created a new theme in theme.json, but it's fine generating short audiograms.

"Youtube": {
"width": 1280,
"height": 720,
"framesPerSecond": 20,
"maxDuration": 5400,
"samplesPerFrame": 64,
"pattern": "roundBars",
"waveTop": 520,
"waveBottom": 720,
"waveRight": 700,
"waveColor": "#FF8000",
"captionTop": 340,
"captionLeft": 20,
"captionRight": 620,
"foregroundColor": "#0eb8ba",
"backgroundImage": "spyt.png"

Any help?