set default color value, when key not exist. (#18696)

* Update Sparkline.php

add addition setup

* Update Sparkline.php

update foreach to array_merge

1 files changed, 4 insertions, 2 deletions

diff --git a/core/Visualization/Sparkline.php b/core/Visualization/Sparkline.php
index e3cff4fb11..1e9abb4484 100644
--- a/core/Visualization/Sparkline.php
+++ b/core/Visualization/Sparkline.php
@@ -177,8 +177,10 @@ class Sparkline implements ViewInterface
             'fillColor' => '#ffffff'
         );
 
-        if (empty($colors)) { // quick fix so row evolution sparklines will have color in widgetize's iframes
-            $colors = $defaultColors;
+        if (empty($colors)) {
+            $colors = $defaultColors; //set default color, if no color passed
+        } else {
+            $colors = array_merge($defaultColors, $colors); //set default color key, if no key set.
         }
 
         if (strtolower($colors['backgroundColor']) !== '#ffffff') {