From 0c9a7f2494dab9c9dc5d3bba1a73996c2b5a745c Mon Sep 17 00:00:00 2001
From: Manuel Luis Sanmartín Rozada
Date: Fri, 25 Jul 2014 18:12:13 +0200
Subject: jsrrdgraph: Check when this.gdes[i].legend is null

---
 js/RrdGraph.js | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/js/RrdGraph.js b/js/RrdGraph.js
index cba141d..642b9c5 100644
--- a/js/RrdGraph.js
+++ b/js/RrdGraph.js
@@ -1697,9 +1697,14 @@ RrdGraph.prototype.leg_place = function (calc_width)
 				if (this.gdes[i].gf === RrdGraphDesc.GF_VRULE && (this.gdes[i].xrule < this.start || this.gdes[i].xrule > this.end))
 					this.gdes[i].legend = null;
 			}
-			this.gdes[i].legend = this.gdes[i].legend.replace(/\\t/gi, "\t") /* turn \\t into tab */
 
-			leg_cc = this.gdes[i].legend.length;
+			if (this.gdes[i].legend != null) {
+				this.gdes[i].legend = this.gdes[i].legend.replace(/\\t/gi, "\t") /* turn \\t into tab */
+				leg_cc = this.gdes[i].legend.length;
+			} else {
+				leg_cc = 0;
+			}
+
 			/* is there a controle code at the end of the legend string ? */
 			if (leg_cc >= 2 && this.gdes[i].legend.charAt(leg_cc - 2) === '\\') {
 				prt_fctn = this.gdes[i].legend.charAt(leg_cc - 1);
-- 
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