diff --git a/packages/libs/eda/src/lib/map/analysis/hooks/defaultOverlayConfig.ts b/packages/libs/eda/src/lib/map/analysis/hooks/defaultOverlayConfig.ts
index 9d691b1632..17e9d751c1 100644
--- a/packages/libs/eda/src/lib/map/analysis/hooks/defaultOverlayConfig.ts
+++ b/packages/libs/eda/src/lib/map/analysis/hooks/defaultOverlayConfig.ts
@@ -43,7 +43,7 @@ export async function getDefaultOverlayConfig(
       entityId: overlayEntity.id,
     };
 
-    if (overlayVariable.vocabulary) {
+    if (overlayVariable.dataShape === 'categorical') {
       // categorical
       const overlayValues = await getMostFrequentValues({
         studyId: studyId,
diff --git a/packages/libs/eda/src/lib/map/analysis/hooks/standaloneMapMarkers.tsx b/packages/libs/eda/src/lib/map/analysis/hooks/standaloneMapMarkers.tsx
index 19c3267183..f19806642c 100644
--- a/packages/libs/eda/src/lib/map/analysis/hooks/standaloneMapMarkers.tsx
+++ b/packages/libs/eda/src/lib/map/analysis/hooks/standaloneMapMarkers.tsx
@@ -289,11 +289,14 @@ export function useStandaloneMapMarkers(
                   overlayType === 'categorical'
                     ? ColorPaletteDefault[vocabulary.indexOf(binLabel)]
                     : gradientSequentialColorscaleMap(
-                        vocabulary.indexOf(binLabel) / (vocabulary.length - 1)
+                        vocabulary.length > 1
+                          ? vocabulary.indexOf(binLabel) /
+                              (vocabulary.length - 1)
+                          : 0.5
                       ),
               }))
             : [];
-
+        console.log({ donutData, overlayType, vocabulary });
         // TO DO: address diverging colorscale (especially if there are use-cases)
 
         // now reorder the data, adding zeroes if necessary.
@@ -382,7 +385,9 @@ export function useStandaloneMapMarkers(
           ? ColorPaletteDefault[vocabulary.indexOf(label)]
           : overlayType === 'continuous'
           ? gradientSequentialColorscaleMap(
-              vocabulary.indexOf(label) / (vocabulary.length - 1)
+              vocabulary.length > 1
+                ? vocabulary.indexOf(label) / (vocabulary.length - 1)
+                : 0.5
             )
           : undefined,
       // has any geo-facet got an array of overlay data