Fix fiche creature

modules/applications/sheets/base-actor-sheet.mjs

@@ -81,6 +81,47 @@ export default class MournbladeCYD2ActorSheetV2 extends HandlebarsApplicationMix
 
   tabGroups = { primary: "stats" };
 
+  /**
+   * Intercept form data before ActorSheetV2 validates it, to sanitize
+   * empty numeric fields that would otherwise fail DataModel validation.
+   * Mirrors the same logic in MournbladeCYD2Actor._preUpdate.
+   * @override
+   */
+  _prepareSubmitData(event, form, formData) {
+    const fd = formData ?? new foundry.applications.ux.FormDataExtended(form);
+    const data = {};
+    for (const [k, v] of fd) {
+      foundry.utils.setProperty(data, k, v);
+    }
+    this._sanitizeNumericData(data);
+    this.document.validate(data, { partial: true });
+    return data;
+  }
+
+  /**
+   * Walk submitted data and convert empty/invalid values in NumberField
+   * paths to 0 so schema validation passes.
+   * @param {object} data
+   */
+  _sanitizeNumericData(data) {
+    if (!data?.system || typeof data.system !== "object") return;
+    const fields = this.document.system.schema.fields;
+    for (const [schemaPath, schemaField] of Object.entries(fields)) {
+      if (!(schemaField instanceof foundry.data.fields.SchemaField)) continue;
+      const branch = data.system[schemaPath];
+      if (!branch || typeof branch !== "object") continue;
+      for (const [key, value] of Object.entries(branch)) {
+        if (schemaField.fields[key] instanceof foundry.data.fields.NumberField) {
+          if (value === "" || value === null || value === undefined || isNaN(value)) {
+            data.system[schemaPath][key] = 0;
+          } else {
+            data.system[schemaPath][key] = Number(value);
+          }
+        }
+      }
+    }
+  }
+
   /** @override */
   async _prepareContext() {
     const actor = this.document;