diff --git a/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue b/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
index 60c0bcd3..e846cfc6 100644
--- a/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
+++ b/src/views/trials/trials-panel/reading/dicoms3D/components/PetCtViewport.vue
@@ -432,6 +432,7 @@ export default {
       } else {
         colorMap = getColormap(presetName)
       }
+      if (!colorMap) return false
       // let colormaps = getColormapNames().map(name => getColormap(name))
       // console.log(colormaps)
       // const canvas = document.getElementById('colorBar_Canvas')