diff --git a/src/api/slot/content-types/slot/lifecycles.ts b/src/api/slot/content-types/slot/lifecycles.ts
index bbf1ec3..6443e1d 100644
--- a/src/api/slot/content-types/slot/lifecycles.ts
+++ b/src/api/slot/content-types/slot/lifecycles.ts
@@ -38,39 +38,42 @@ export default {
     const { id: entityId } = where;
     const { time_start, time_end } = data;
 
-    if (!time_start || !time_end) {
-      throw new Error(ERR_INVALID_TIME);
-    }
+    if (time_start && time_end) {
+      if (!time_start || !time_end) {
+        throw new Error(ERR_INVALID_TIME);
+      }
 
-    if (timeToDate(time_start) >= timeToDate(time_end)) {
-      throw new Error(ERR_INVALID_TIME);
-    }
+      if (timeToDate(time_start) >= timeToDate(time_end)) {
+        throw new Error(ERR_INVALID_TIME);
+      }
 
-    const existingEntity = await strapi.db.query('api::slot.slot').findOne({
-      where: { id: entityId },
-      select: ['date', 'documentId'],
-    });
-
-    if (!existingEntity) {
-      throw new Error('Запись не найдена');
-    }
-
-    const { date, documentId } = existingEntity;
-
-    const overlappingEntities = await strapi.db
-      .query('api::slot.slot')
-      .findMany({
-        where: {
-          date,
-          id: { $ne: entityId },
-          documentId: { $ne: documentId },
-          time_start: { $lt: time_end },
-          time_end: { $gt: time_start },
-        },
+      const existingEntity = await strapi.db.query('api::slot.slot').findOne({
+        where: { id: entityId },
+        select: ['date', 'documentId'],
       });
 
-    if (overlappingEntities.length > 0) {
-      throw new Error(ERR_OVERLAPPING_TIME);
+      if (!existingEntity) {
+        throw new Error('Запись не найдена');
+      }
+
+      const { date, documentId } = existingEntity;
+
+      const overlappingEntities = await strapi.db
+        .query('api::slot.slot')
+        .findMany({
+          where: {
+            date,
+            id: { $ne: entityId },
+            documentId: { $ne: documentId },
+            time_start: { $lt: time_end },
+            time_end: { $gt: time_start },
+          },
+        });
+
+      if (overlappingEntities.length > 0) {
+        throw new Error(ERR_OVERLAPPING_TIME);
+      }
     }
   },
 };
+