increase spacing until there is a range

src/scales/scale.linearbase.js

@@ -22,6 +22,7 @@ function generateTicks(generationOptions, dataRange) {
 	var max = generationOptions.max;
 	var precision = generationOptions.precision;
 	var spacing, factor, niceMin, niceMax, numSpaces;
+	var i = 0;
 
 	// spacing is set to a nice number of the dataRange divided by maxNumSpaces.
 	// stepSize is used as a minimum unit if it is specified.
@@ -40,9 +41,12 @@ function generateTicks(generationOptions, dataRange) {
 		factor = Math.pow(10, precision);
 		spacing = Math.ceil(spacing * factor) / factor;
 	}
-
-	niceMin = Math.floor(dataRange.min / spacing) * spacing;
-	niceMax = Math.ceil(dataRange.max / spacing) * spacing;
+	do {
+		niceMin = Math.floor(dataRange.min / spacing) * spacing;
+		niceMax = Math.ceil(dataRange.max / spacing) * spacing;
+		spacing *= 2;
+	} while (niceMin === niceMax && ++i < 8);
+	spacing /= 2;
 
 	// If min, max and stepSize is set and they make an evenly spaced scale use it.
 	if (stepSize) {

test/specs/scale.linear.tests.js

@@ -1170,4 +1170,29 @@ describe('Linear Scale', function() {
 		expect(data[0]._model.base + minBarLength).toEqual(data[0]._model.x);
 		expect(data[1]._model.base - minBarLength).toEqual(data[1]._model.x);
 	});
+
+	it('Should ensure that the scale has a max and min that are not equal when data contains values that are very close to each other', function() {
+		var chart = window.acquireChart({
+			type: 'scatter',
+			data: {
+				datasets: [{
+					data: [
+						{x: 1, y: 1.8548483304974972},
+						{x: 2, y: 1.8548483304974974},
+					]
+				}],
+			},
+			options: {
+				scales: {
+					yAxes: [{
+						id: 'yScale0',
+						type: 'linear',
+					}]
+				}
+			}
+		});
+
+		expect(chart.scales.yScale0).not.toEqual(undefined); // must construct
+		expect(chart.scales.yScale0.max).toBeGreaterThan(chart.scales.yScale0.min);
+	});
 });