diff --git a/apps/api/plane/app/views/cycle/issue.py b/apps/api/plane/app/views/cycle/issue.py
index e4fb00ca2a4..6aeb3f7dfdb 100644
--- a/apps/api/plane/app/views/cycle/issue.py
+++ b/apps/api/plane/app/views/cycle/issue.py
@@ -274,8 +274,20 @@ def create(self, request, slug, project_id, cycle_id):
                 for issue in new_issues
             ],
             batch_size=10,
+            # Concurrent add-issue requests can both pass the unlocked
+            # existing-issue check above and insert the same (cycle, issue),
+            # violating the cycle_issue_when_deleted_at_null unique constraint.
+            # Skip the duplicates instead of raising, matching the module and
+            # external-API equivalents.
+            ignore_conflicts=True,
         )
 
+        # ON CONFLICT DO NOTHING does not populate PKs on skipped rows, so a
+        # concurrent request that lost the race gets its duplicates back here
+        # with pk=None. Drop them before the activity log below, otherwise it
+        # records a "created" entry for an insert that was silently discarded.
+        created_records = [record for record in created_records if record.pk is not None]
+
         # Updated Issues
         updated_records = []
         update_cycle_issue_activity = []