From: Tore Lervik <tore@lervik.com>
Date: Mon, 21 Dec 2015 21:34:31 +0000 (+0100)
Subject: firstTick and lastTick can be null if the chart is empty.
X-Git-Tag: 2.0.0-beta2~10^2~2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=477fc726939f670584a8adf1f096352bb8ccb491;p=thirdparty%2FChart.js.git

firstTick and lastTick can be null if the chart is empty.
---

diff --git a/src/scales/scale.time.js b/src/scales/scale.time.js
index a1ce6a35e..6d17e5ee5 100644
--- a/src/scales/scale.time.js
+++ b/src/scales/scale.time.js
@@ -126,8 +126,15 @@
 			}, this);
 
 			// We will modify these, so clone for later
-			this.firstTick = this.firstTick.clone();
-			this.lastTick = this.lastTick.clone();
+			if (this.firstTick != null)
+                this.firstTick = this.firstTick.clone();
+            else
+                this.firstTick = moment(new Date);
+
+            if (this.lastTick != null)
+                this.lastTick = this.lastTick.clone();
+            else
+                this.lastTick = moment(new Date);
 		},
 		buildTicks: function(index) {