diff --git a/src/services/theme_data/theme_data.service.js b/src/services/theme_data/theme_data.service.js
index 44fb575c..4d7e4f67 100644
--- a/src/services/theme_data/theme_data.service.js
+++ b/src/services/theme_data/theme_data.service.js
@@ -384,6 +384,9 @@ export const getColors = (sourceColors, sourceOpacity) => SLOT_ORDERED.reduce(({
             : (OPACITIES[opacitySlot] || {}).defaultValue
         )
       }
+      if (Number.isNaN(outputColor.a)) {
+        outputColor.a = 1
+      }
     }
   }