diff --git a/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue b/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
index 17c33bfd5..441adeb05 100644
--- a/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
+++ b/misc/config_tools/configurator/packages/configurator/src/pages/Config.vue
@@ -358,7 +358,10 @@ export default {
         configurator.writeFile(this.WorkingFolder + 'scenario.xml', scenarioXMLData)
             .then(() => {
               step = 1
-              configurator.pythonObject.validateScenario(this.board.content, scenarioXMLData)
+              this.errors = configurator.pythonObject.validateScenario(this.board.content, scenarioXMLData)
+              if (this.errors.length != 0) {
+                  throw "validation failed"
+              }
             })
             .then(() => {
               step = 2
diff --git a/misc/config_tools/configurator/packages/configurator/src/pages/Config/ConfigForm/CustomWidget/cpu_affinity.vue b/misc/config_tools/configurator/packages/configurator/src/pages/Config/ConfigForm/CustomWidget/cpu_affinity.vue
index 159d22323..00a26901c 100644
--- a/misc/config_tools/configurator/packages/configurator/src/pages/Config/ConfigForm/CustomWidget/cpu_affinity.vue
+++ b/misc/config_tools/configurator/packages/configurator/src/pages/Config/ConfigForm/CustomWidget/cpu_affinity.vue
@@ -114,7 +114,7 @@ export default {
       return `${this.rootFormData.name} vCPU ${index}`
     },
     addPCPU(index) {
-      this.defaultVal.pcpu.splice(index + 1, 0, {pcpu_id: null, real_time_vcpu: false})
+      this.defaultVal.pcpu.splice(index + 1, 0, {pcpu_id: null, real_time_vcpu: "n"})
     },
     removePCPU(index) {
       if (this.defaultVal.pcpu.length === 1) {
@@ -144,4 +144,4 @@ export default {
   background: #f9f9f9;
   padding: 5px 5px 3px;
 }
-</style>
\ No newline at end of file
+</style>