error when using node-canvas alpha.8

my package.json versions

“canvas”: “2.0.0-alpha.8” “chart.js”: “^2.7.1”, “chartjs-node”: “^1.6.0”,

---

When using "canvas": "^2.0.0-alpha.2", node-chartjs works like a charm, when using "canvas": "^2.0.0-alpha.8", item is null in acquireContext so item.length errors in platform.dom.js

	acquireContext: function(item, config) {
		if (typeof item === 'string') {
			item = document.getElementById(item);
		} else if (item.length) {
			// Support for array based queries (such as jQuery)
			item = item[0];
		}

		if (item && item.canvas) {
			// Support for any object associated to a canvas (including a context2d)
			item = item.canvas;
		}

		// To prevent canvas fingerprinting, some add-ons undefine the getContext
		// method, for example: https://github.com/kkapsner/CanvasBlocker
		// https://github.com/chartjs/Chart.js/issues/2807
		var context = item && item.getContext && item.getContext('2d');

		// `instanceof HTMLCanvasElement/CanvasRenderingContext2D` fails when the item is
		// inside an iframe or when running in a protected environment. We could guess the
		// types from their toString() value but let's keep things flexible and assume it's
		// a sufficient condition if the item has a context2D which has item as `canvas`.
		// https://github.com/chartjs/Chart.js/issues/3887
		// https://github.com/chartjs/Chart.js/issues/4102
		// https://github.com/chartjs/Chart.js/issues/4152
		if (context && context.canvas === item) {
			initCanvas(item, config);
			return context;
		}

		return null;
	},

Can someone please help me and tell me what im doing wrong?

[thofnar]

@gonnza thanks! I ended up downgrading to canvas 1.6.13 and that is working just fine. Thanks for the input, that definitely helped me out! 😃

[trysheepy]

bump, also having this problem with canvas 2.x, but resolves with older versions. Any updates on why this is happening with recent versions?

The error is: “Unhandled rejection TypeError: Cannot read property ‘length’ of null”.

node: 8.11.3 chartjs-node: 1.7.1 chart.js: 2.7.3 canvas: 2.3.1 OS: Mac 10.14.2

Any better solutions than just downgrading the canvas version?