diff --git a/umap/static/umap/js/modules/utils.js b/umap/static/umap/js/modules/utils.js
index 82819ed0..94292d8a 100644
--- a/umap/static/umap/js/modules/utils.js
+++ b/umap/static/umap/js/modules/utils.js
@@ -28,13 +28,14 @@ export function checkId(string) {
 /**
  * Compute the impacts for a given list of fields.
  * 
- * Return a set containing the impacts.
+ * Return an array of unique impacts.
  * 
  * @param {fields} list[fields]
- * @returns Set[string]
+ * @returns Array[string]
  */
-export function getImpactsFromSchema(fields) {
-  return fields
+export function getImpactsFromSchema(fields, schema) {
+  schema = schema || U.SCHEMA
+  let impacted = fields
     .map((field) => {
       // remove the option prefix for fields
       // And only keep the first part in case of a subfield
@@ -44,10 +45,12 @@ export function getImpactsFromSchema(fields) {
     .reduce((acc, field) => {
       // retrieve the "impacts" field from the schema
       // and merge them together using sets
-      const impacts = U.SCHEMA[field]?.impacts || []
+      const impacts = schema[field]?.impacts || []
       impacts.forEach((impact) => acc.add(impact))
       return acc
     }, new Set())
+
+  return Array.from(impacted)
 }
 
 /**
diff --git a/umap/static/umap/test/Util.js b/umap/static/umap/test/Util.js
index 08852926..32c8527a 100644
--- a/umap/static/umap/test/Util.js
+++ b/umap/static/umap/test/Util.js
@@ -546,4 +546,58 @@ describe('L.Util', function () {
       assert.equal(features[2], feat2)
     })
   })
+
+  describe('#getImpactsFromSchema()', function () {
+    let getImpactsFromSchema = U.Utils.getImpactsFromSchema
+    it('should return an array', function () {
+      expect(getImpactsFromSchema(['foo'], {})).to.be.an('array')
+      expect(getImpactsFromSchema(['foo'], { foo: {} })).to.be.an('array')
+      expect(getImpactsFromSchema(['foo'], { foo: { impacts: [] } })).to.be.an('array')
+      expect(getImpactsFromSchema(['foo'], { foo: { impacts: ['A'] } })).to.be.an(
+        'array'
+      )
+    })
+
+    it('should return a list of unique impacted values', function () {
+      let schema = {
+        foo: { impacts: ['A'] },
+        bar: { impacts: ['A', 'B'] },
+        baz: { impacts: ['B', 'C'] },
+      }
+
+      assert.deepEqual(getImpactsFromSchema(['foo'], schema), ['A'])
+      assert.deepEqual(getImpactsFromSchema(['foo', 'bar'], schema), ['A', 'B'])
+      assert.deepEqual(getImpactsFromSchema(['foo', 'bar', 'baz'], schema), [
+        'A',
+        'B',
+        'C',
+      ])
+    })
+    it('should return an empty list if nothing is found', function () {
+      let schema = {
+        foo: { impacts: ['A'] },
+        bar: { impacts: ['A', 'B'] },
+        baz: { impacts: ['B', 'C'] },
+      }
+
+      assert.deepEqual(getImpactsFromSchema(['bad'], schema), [])
+    })
+
+    it('should return an empty list if the schema key does not exist', function () {
+      let schema = {
+        foo: { impacts: ['A'] },
+      }
+
+      assert.deepEqual(getImpactsFromSchema(['bad'], schema), [])
+    })
+    it('should work if the "impacts" key is not defined', function () {
+      let schema = {
+        foo: {},
+        bar: { impacts: ['A'] },
+        baz: { impacts: ['B'] },
+      }
+
+      assert.deepEqual(getImpactsFromSchema(['foo', 'bar', 'baz'], schema), ['A', 'B'])
+    })
+  })
 })