diff --git a/core/components/minishop3/tests/OrderSaveRecalcRaceTest.php b/core/components/minishop3/tests/OrderSaveRecalcRaceTest.php
new file mode 100644
index 00000000..9ab90afd
--- /dev/null
+++ b/core/components/minishop3/tests/OrderSaveRecalcRaceTest.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * Guards OrderView save/recalculate in-flight lock (issue #379).
+ *
+ * Run: php tests/OrderSaveRecalcRaceTest.php
+ */
+
+declare(strict_types=1);
+
+$fail = static function (string $message): never {
+    fwrite(STDERR, "FAIL: {$message}\n");
+    exit(1);
+};
+
+$repoRoot = dirname(__DIR__, 4);
+$orderView = $repoRoot . '/vueManager/src/components/OrderView.vue';
+$actionsBar = $repoRoot . '/vueManager/src/components/order/OrderFormActionsBar.vue';
+
+foreach ([$orderView => 'OrderView.vue', $actionsBar => 'OrderFormActionsBar.vue'] as $path => $label) {
+    if (!is_readable($path)) {
+        $fail("cannot read {$label}");
+    }
+}
+
+$orderViewSource = file_get_contents($orderView);
+$actionsBarSource = file_get_contents($actionsBar);
+
+if ($orderViewSource === false || $actionsBarSource === false) {
+    $fail('cannot read vue sources');
+}
+
+if (!preg_match('/async function saveOrder\(\)[\s\S]*?if \(recalculatingCost\.value \|\| saving\.value\)/', $orderViewSource)) {
+    $fail('saveOrder must bail out when recalculatingCost or saving is active');
+}
+
+if (!preg_match('/async function recalculateOrderCost[\s\S]*?if \(saving\.value \|\| recalculatingCost\.value\)/', $orderViewSource)) {
+    $fail('recalculateOrderCost must bail out when saving or recalculatingCost is active');
+}
+
+if (!str_contains($actionsBarSource, 'recalculatingCost')) {
+    $fail('OrderFormActionsBar must accept recalculatingCost prop');
+}
+
+if (!str_contains($actionsBarSource, ':disabled="recalculatingCost"')) {
+    $fail('Save button must be disabled while recalculatingCost');
+}
+
+fwrite(STDOUT, "OK OrderSaveRecalcRaceTest\n");
+exit(0);
diff --git a/vueManager/src/components/OrderView.vue b/vueManager/src/components/OrderView.vue
index 589f7286..6b9f5f95 100644
--- a/vueManager/src/components/OrderView.vue
+++ b/vueManager/src/components/OrderView.vue
@@ -1024,6 +1024,9 @@ async function recalculateOrderCost(opts = {}) {
   if (isCreateMode.value || !orderId.value || orderId.value === 'new') {
     return
   }
+  if (saving.value || recalculatingCost.value) {
+    return
+  }
 
   recalculatingCost.value = true
   costRecalcWarnings.value = []
@@ -1065,6 +1068,10 @@ async function recalculateOrderCost(opts = {}) {
  * Save order
  */
 async function saveOrder() {
+  if (recalculatingCost.value || saving.value) {
+    return
+  }
+
   saving.value = true
 
   try {
diff --git a/vueManager/src/components/order/OrderAddressTab.vue b/vueManager/src/components/order/OrderAddressTab.vue
index a7d638c5..be400f62 100644
--- a/vueManager/src/components/order/OrderAddressTab.vue
+++ b/vueManager/src/components/order/OrderAddressTab.vue
@@ -53,6 +53,7 @@ const {
   createOrder,
   saveOrder,
   goBack,
+  recalculatingCost,
 } = orderCtx
 
 const { _ } = useLexicon()
@@ -242,6 +243,7 @@ const showAddressTabActions = computed(
       v-if="showAddressTabActions"
       :is-create-mode="isCreateMode"
       :saving="saving"
+      :recalculating-cost="recalculatingCost"
       @create="createOrder"
       @save="saveOrder"
       @cancel="goBack"
diff --git a/vueManager/src/components/order/OrderFormActionsBar.vue b/vueManager/src/components/order/OrderFormActionsBar.vue
index 5ce86aa2..5b871490 100644
--- a/vueManager/src/components/order/OrderFormActionsBar.vue
+++ b/vueManager/src/components/order/OrderFormActionsBar.vue
@@ -5,6 +5,8 @@ import Button from 'primevue/button'
 defineProps({
   isCreateMode: { type: Boolean, required: true },
   saving: { type: Boolean, default: false },
+  /** Blocks save while manager cost recalculation is in flight (#379). */
+  recalculatingCost: { type: Boolean, default: false },
 })
 
 const emit = defineEmits(['create', 'save', 'cancel'])
@@ -26,6 +28,7 @@ const { _ } = useLexicon()
       :label="_('save')"
       icon="pi pi-check"
       :loading="saving"
+      :disabled="recalculatingCost"
       @click="emit('save')"
     />
     <Button
diff --git a/vueManager/src/components/order/OrderInfoTab.vue b/vueManager/src/components/order/OrderInfoTab.vue
index 1daa6ec4..e87d8a68 100644
--- a/vueManager/src/components/order/OrderInfoTab.vue
+++ b/vueManager/src/components/order/OrderInfoTab.vue
@@ -306,6 +306,7 @@ const showOrderInfoActions = computed(
       v-if="showOrderInfoActions"
       :is-create-mode="isCreateMode"
       :saving="saving"
+      :recalculating-cost="recalculatingCost"
       @create="createOrder"
       @save="saveOrder"
       @cancel="goBack"