diff --git a/src/app/modules/colors/components/mix-editor/mix-editor.component.ts b/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
index 11e37a8..1ebd7bc 100644
--- a/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
+++ b/src/app/modules/colors/components/mix-editor/mix-editor.component.ts
@@ -61,6 +61,9 @@ export class MixEditorComponent extends ErrorHandlingComponent {
   }, {
     filter: error => error.type === 'cannotdelete-mix',
     messageProducer: error => 'Ce mélange est utilisé par un ou plusieurs autres mélanges'
+  }, {
+    filter: error => error.type === 'invalid-mixmaterial-first',
+    messageProducer: error => 'La quantité du premier ingrédient du mélange ne peut pas être exprimée en pourcentage'
   }]
 
   constructor(
diff --git a/src/app/modules/shared/service/error.service.ts b/src/app/modules/shared/service/error.service.ts
index 551e26f..f7774c2 100644
--- a/src/app/modules/shared/service/error.service.ts
+++ b/src/app/modules/shared/service/error.service.ts
@@ -57,6 +57,7 @@ export class ErrorService {
 
     if (!matchingModels || matchingModels.length == 0) {  // If none are found, search in defaults handlers
       matchingModels = ErrorService.DEFAULT_ERROR_HANDLERS.filter(m => m.filter(error))
+      console.error(error)
     }
 
     if (!matchingModels || matchingModels.length == 0) { // If still none are found, handle as an unknown error