diff --git a/api-test/frontend/src/business/definition/components/assertion/ApiAssertionDuration.vue b/api-test/frontend/src/business/definition/components/assertion/ApiAssertionDuration.vue
index 53afd24387..a4634fa02b 100644
--- a/api-test/frontend/src/business/definition/components/assertion/ApiAssertionDuration.vue
+++ b/api-test/frontend/src/business/definition/components/assertion/ApiAssertionDuration.vue
@@ -81,6 +81,13 @@ export default {
       }
     },
     input(value) {
+      if (value === '' || Number(value) <= 0) {
+        this.$warning(this.$t('commons.response_time_warning'));
+        if (this.duration.value) {
+          this.value = this.duration.value;
+        }
+        return;
+      }
       this.$emit('input', value);
     },
     validate() {
diff --git a/api-test/frontend/src/business/definition/components/assertion/ApiAssertions.vue b/api-test/frontend/src/business/definition/components/assertion/ApiAssertions.vue
index e5e19b8672..0ca0d17a7b 100644
--- a/api-test/frontend/src/business/definition/components/assertion/ApiAssertions.vue
+++ b/api-test/frontend/src/business/definition/components/assertion/ApiAssertions.vue
@@ -154,7 +154,7 @@ export default {
   data() {
     return {
       options: ASSERTION_TYPE,
-      time: '',
+      time: 1,
       type: '',
       loading: false,
       reloadData: '',