diff --git a/module/actor/actor.js b/module/actor/actor.js
index 2b01fb0..d4f7826 100644
--- a/module/actor/actor.js
+++ b/module/actor/actor.js
@@ -5037,13 +5037,19 @@ export class MothershipActor extends Actor {
       };
       await this.update(updateData);
       const validIds = restrictedIds.filter(id => this.items.get(id) !== undefined);
+      let removed = 0;
       if (validIds.length) {
-        await this.deleteEmbeddedDocuments("Item", validIds);
+        try {
+          await this.deleteEmbeddedDocuments("Item", validIds);
+          removed = validIds.length;
+        } catch (err) {
+          // Concurrent enforcement calls may have already deleted these items — safe to ignore
+        }
       }
-      if (notify && validIds.length) {
+      if (notify && removed) {
         ui.notifications.warn(`${this.name} is not an Ebb user. Restricted Ebb skills and abilities were removed.`);
       }
-      return { removed: validIds.length };
+      return { removed };
     }
 
     const currentMax = Math.max(0, Number(this.system?.sla?.flux?.max ?? 0) || 0);
diff --git a/module/mosh.js b/module/mosh.js
index a554c46..4867f1e 100644
--- a/module/mosh.js
+++ b/module/mosh.js
@@ -144,11 +144,20 @@ Hooks.once('init', async function () {
     await SLADrugSystem.handleEffectDeleted(effect, options);
   });
 
-  Hooks.on("createItem", async (item) => {
+  // Debounce map: actorId → pending timeout handle.
+  // Prevents enforceSlaEbbEligibility from being called once per item when the
+  // character generator creates many items in rapid succession (each createItem
+  // hook call would otherwise race to delete the same Ebb items concurrently).
+  const _pendingEbbEnforcement = new Map();
+  Hooks.on("createItem", (item) => {
     const actor = item.parent;
     if (!actor || actor.type !== "character" || typeof actor.enforceSlaEbbEligibility !== "function") return;
     if (actor.isSlaEbbUser?.()) return;
-    await actor.enforceSlaEbbEligibility({ notify: true, refillFlux: false });
+    if (_pendingEbbEnforcement.has(actor.id)) clearTimeout(_pendingEbbEnforcement.get(actor.id));
+    _pendingEbbEnforcement.set(actor.id, setTimeout(async () => {
+      _pendingEbbEnforcement.delete(actor.id);
+      await actor.enforceSlaEbbEligibility({ notify: true, refillFlux: false });
+    }, 300));
   });
 
   Hooks.on("updateActor", async (actor, changes, options) => {