1 files 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);