diff --git a/src/extensions/default/InlineTimingFunctionEditor/TimingFunctionUtils.js b/src/extensions/default/InlineTimingFunctionEditor/TimingFunctionUtils.js
index 687239f8309..4896e107911 100644
--- a/src/extensions/default/InlineTimingFunctionEditor/TimingFunctionUtils.js
+++ b/src/extensions/default/InlineTimingFunctionEditor/TimingFunctionUtils.js
@@ -60,15 +60,15 @@ define(function (require, exports, module) {
      * If string is a number, then convert it.
      *
      * @param {string} str  value parsed from page.
-     * @return { isNumber: boolean, value: number } 
+     * @return { isNumber: boolean, value: ?number }
      */
     function _convertToNumber(str) {
-        if (typeof (str) !== "string") {
-            return { isNumber: false };
+        if (typeof str !== "string") {
+            return { isNumber: false, value: null };
         }
 
-        var val = parseFloat(str, 10),
-            isNum = (typeof (val) === "number") && !isNaN(val) &&
+        var val = parseFloat(+str, 10),
+            isNum = (typeof val === "number") && !isNaN(val) &&
                     (val !== Infinity) && (val !== -Infinity);
 
         return {
diff --git a/src/extensions/default/InlineTimingFunctionEditor/unittests.js b/src/extensions/default/InlineTimingFunctionEditor/unittests.js
index cc85c37a23b..c56764202a7 100644
--- a/src/extensions/default/InlineTimingFunctionEditor/unittests.js
+++ b/src/extensions/default/InlineTimingFunctionEditor/unittests.js
@@ -215,6 +215,9 @@ define(function (require, exports, module) {
             it("should correct cubic-bezier function with 5 parameters", function () {
                 testInvalidBezier("cubic-bezier(0, 0, 1, 1, 1)", ["cubic-bezier(0, 0, 1, 1)", "0", "0", "1", "1"]);
             });
+            it("should correct cubic-bezier function with trailing comma", function () {
+                testInvalidBezier("cubic-bezier(.42, 0, .58, .5,)", ["cubic-bezier(.42, 0, .58, .5)", ".42", "0", ".58", ".5"]);
+            });
             
             // Real invalid cubic-beziers - they should NOT be corrected automatically
             it("should not match cubic-bezier function with invalid whitespace", function () {