diff --git a/src/controllers/controller.bar.js b/src/controllers/controller.bar.js
index 60470f593ef..0eabca186cf 100644
--- a/src/controllers/controller.bar.js
+++ b/src/controllers/controller.bar.js
@@ -328,7 +328,7 @@ module.exports = DatasetController.extend({
 				}
 
 				if (imeta.stack === stack) {
-					stackLength = scale._parseValue(datasets[i].data[index]);
+					stackLength = scale._parseValue(datasets[imeta.index].data[index]);
 					ivalue = stackLength.start === undefined ? stackLength.end : stackLength.min >= 0 && stackLength.max >= 0 ? stackLength.max : stackLength.min;
 
 					if ((value.min < 0 && ivalue < 0) || (value.max >= 0 && ivalue > 0)) {
diff --git a/src/scales/scale.linear.js b/src/scales/scale.linear.js
index 63aad3a6f05..535b185d271 100644
--- a/src/scales/scale.linear.js
+++ b/src/scales/scale.linear.js
@@ -23,11 +23,11 @@ function getMatchingVisibleMetas(scale) {
 		});
 }
 
-function getStack(stacks, stacked, meta) {
+function getOrCreateStack(stacks, stacked, meta) {
 	var key = [
 		meta.type,
 		// we have a separate stack for stack=undefined datasets when the opts.stacked is undefined
-		((stacked === undefined && meta.stack === undefined) ? meta.index : ''),
+		stacked === undefined && meta.stack === undefined ? meta.index : '',
 		meta.stack
 	].join('.');
 
@@ -44,14 +44,14 @@ function getStack(stacks, stacked, meta) {
 function stackData(scale, stacks, meta, data) {
 	var opts = scale.options;
 	var stacked = opts.stacked;
-	var stack = getStack(stacks, stacked, meta);
+	var stack = getOrCreateStack(stacks, stacked, meta);
 	var pos = stack.pos;
 	var neg = stack.neg;
 	var ilen = data.length;
 	var i, value;
 
 	for (i = 0; i < ilen; ++i) {
-		value = this._parseValue(data[i]);
+		value = scale._parseValue(data[i]);
 		if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden) {
 			continue;
 		}
@@ -74,7 +74,7 @@ function updateMinMax(scale, meta, data) {
 	var i, value;
 
 	for (i = 0; i < ilen; ++i) {
-		value = this._parseValue(data[i]);
+		value = scale._parseValue(data[i]);
 
 		if (isNaN(value.min) || isNaN(value.max) || meta.data[i].hidden) {
 			continue;