ensure to multiply by a number

PolymerElements · Oct 10, 2017 · 58d536e · 58d536e
1 parent 2732f95
commit 58d536e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/app-scroll-effects/effects/parallax-background.html b/app-scroll-effects/effects/parallax-background.html
@@ -30,7 +30,7 @@
         if (isNaN(scalar)) {
           scalar = 0.8;
         }
-        fx.deltaBg = this._dHeight * scalar;
+        fx.deltaBg = (this._dHeight || 0) * scalar;
       } else {
         if (isNaN(scalar)) {
           scalar = 1;