diff --git a/src/components/fx/helpers.js b/src/components/fx/helpers.js
index 0f6b0aa52d4..9ce5acd160b 100644
--- a/src/components/fx/helpers.js
+++ b/src/components/fx/helpers.js
@@ -108,9 +108,14 @@ exports.appendArrayPointValue = function(pointData, trace, pointNumber) {
 
         if(pointData[key] === undefined) {
             var val = Lib.nestedProperty(trace, astr).get();
-            pointData[key] = Array.isArray(pointNumber) ?
-                val[pointNumber[0]][pointNumber[1]] :
-                val[pointNumber];
+
+            if(Array.isArray(pointNumber)) {
+                if(Array.isArray(val) && Array.isArray(val[pointNumber[0]])) {
+                    pointData[key] = val[pointNumber[0]][pointNumber[1]];
+                }
+            } else {
+                pointData[key] = val[pointNumber];
+            }
         }
     }
 };
diff --git a/src/plot_api/plot_schema.js b/src/plot_api/plot_schema.js
index c3a259f1384..27fab419cd7 100644
--- a/src/plot_api/plot_schema.js
+++ b/src/plot_api/plot_schema.js
@@ -142,13 +142,25 @@ exports.isValObject = function(obj) {
  *  list of array attributes for the given trace
  */
 exports.findArrayAttributes = function(trace) {
-    var arrayAttributes = [],
-        stack = [];
+    var arrayAttributes = [];
+    var stack = [];
 
     function callback(attr, attrName, attrs, level) {
         stack = stack.slice(0, level).concat([attrName]);
 
-        var splittableAttr = attr && (attr.valType === 'data_array' || attr.arrayOk === true);
+        var splittableAttr = (
+            attr &&
+            (attr.valType === 'data_array' || attr.arrayOk === true) &&
+            !(stack[level - 1] === 'colorbar' && (attrName === 'ticktext' || attrName === 'tickvals'))
+        );
+
+        // Manually exclude 'colorbar.tickvals' and 'colorbar.ticktext' for now
+        // which are declared as `valType: 'data_array'` but scale independently of
+        // the coordinate arrays.
+        //
+        // Down the road, we might want to add a schema field (e.g `uncorrelatedArray: true`)
+        // to distinguish attributes of the likes.
+
         if(!splittableAttr) return;
 
         var astr = toAttrString(stack);
diff --git a/test/jasmine/tests/cartesian_interact_test.js b/test/jasmine/tests/cartesian_interact_test.js
index 3bd985c5b9c..e59b79188dd 100644
--- a/test/jasmine/tests/cartesian_interact_test.js
+++ b/test/jasmine/tests/cartesian_interact_test.js
@@ -440,3 +440,83 @@ describe('axis zoom/pan and main plot zoom', function() {
         .then(done);
     });
 });
+
+describe('Event data:', function() {
+    var gd;
+
+    beforeEach(function() {
+        gd = createGraphDiv();
+    });
+
+    afterEach(destroyGraphDiv);
+
+    function _hover(px, py) {
+        return new Promise(function(resolve, reject) {
+            gd.once('plotly_hover', function(d) {
+                delete gd._lastHoverTime;
+                resolve(d);
+            });
+
+            mouseEvent('mousemove', px, py);
+
+            setTimeout(function() {
+                reject('plotly_hover did not get called!');
+            }, 100);
+        });
+    }
+
+    it('should have correct content for *scatter* traces', function(done) {
+        Plotly.plot(gd, [{
+            y: [1, 2, 1],
+            marker: {
+                color: [20, 30, 10],
+                colorbar: {
+                    tickvals: [25],
+                    ticktext: ['one single tick']
+                }
+            }
+        }], {
+            width: 500,
+            height: 500
+        })
+        .then(function() { return _hover(200, 200); })
+        .then(function(d) {
+            var pt = d.points[0];
+
+            expect(pt.y).toBe(2, 'y');
+            expect(pt['marker.color']).toBe(30, 'marker.color');
+            expect('marker.colorbar.tickvals' in pt).toBe(false, 'marker.colorbar.tickvals');
+            expect('marker.colorbar.ticktext' in pt).toBe(false, 'marker.colorbar.ticktext');
+        })
+        .catch(fail)
+        .then(done);
+    });
+
+    it('should have correct content for *heatmap* traces', function(done) {
+        Plotly.plot(gd, [{
+            type: 'heatmap',
+            z: [[1, 2, 1], [2, 3, 1]],
+            colorbar: {
+                tickvals: [2],
+                ticktext: ['one single tick']
+            },
+            text: [['incomplete array']],
+            ids: [['incomplete array']]
+        }], {
+            width: 500,
+            height: 500
+        })
+        .then(function() { return _hover(200, 200); })
+        .then(function(d) {
+            var pt = d.points[0];
+
+            expect(pt.z).toBe(3, 'z');
+            expect(pt.text).toBe(undefined, 'undefined text items are included');
+            expect('id' in pt).toBe(false, 'undefined ids items are not included');
+            expect('marker.colorbar.tickvals' in pt).toBe(false, 'marker.colorbar.tickvals');
+            expect('marker.colorbar.ticktext' in pt).toBe(false, 'marker.colorbar.ticktext');
+        })
+        .catch(fail)
+        .then(done);
+    });
+});
diff --git a/test/jasmine/tests/gl_plot_interact_test.js b/test/jasmine/tests/gl_plot_interact_test.js
index ae2b085cf16..7e06a5de92f 100644
--- a/test/jasmine/tests/gl_plot_interact_test.js
+++ b/test/jasmine/tests/gl_plot_interact_test.js
@@ -245,6 +245,20 @@ describe('Test gl3d plots', function() {
 
             expect(label.size()).toEqual(1);
             expect(label.select('text').text()).toEqual('2');
+
+            return Plotly.restyle(gd, {
+                'colorbar.tickvals': [[25]],
+                'colorbar.ticktext': [['single tick!']]
+            });
+        })
+        .then(_hover)
+        .then(function() {
+            assertEventData(1, 2, 43, 0, [1, 2], {
+                'hoverinfo': 'y',
+                'hoverlabel.font.color': 'cyan',
+                'colorbar.tickvals': undefined,
+                'colorbar.ticktext': undefined
+            });
         })
         .then(done);
     });