diff --git a/api/core/plugin/backwards_invocation/app.py b/api/core/plugin/backwards_invocation/app.py
index e8c9bed09..cf62dc6ab 100644
--- a/api/core/plugin/backwards_invocation/app.py
+++ b/api/core/plugin/backwards_invocation/app.py
@@ -154,7 +154,7 @@ class PluginAppBackwardsInvocation(BaseBackwardsInvocation):
         """
         workflow = app.workflow
         if not workflow:
-            raise ValueError("")
+            raise ValueError("unexpected app type")
 
         return WorkflowAppGenerator().generate(
             app_model=app,
diff --git a/api/docker/entrypoint.sh b/api/docker/entrypoint.sh
index e21092349..ddef26faa 100755
--- a/api/docker/entrypoint.sh
+++ b/api/docker/entrypoint.sh
@@ -31,7 +31,7 @@ if [[ "${MODE}" == "worker" ]]; then
   fi
 
   exec celery -A app.celery worker -P ${CELERY_WORKER_CLASS:-gevent} $CONCURRENCY_OPTION \
-    --max-tasks-per-child ${MAX_TASK_PRE_CHILD:-50} --loglevel ${LOG_LEVEL:-INFO} \
+    --max-tasks-per-child ${MAX_TASKS_PER_CHILD:-50} --loglevel ${LOG_LEVEL:-INFO} \
     -Q ${CELERY_QUEUES:-dataset,mail,ops_trace,app_deletion,plugin,workflow_storage,conversation}
 
 elif [[ "${MODE}" == "beat" ]]; then
diff --git a/api/fields/data_source_fields.py b/api/fields/data_source_fields.py
index 93f6e447d..27ab50537 100644
--- a/api/fields/data_source_fields.py
+++ b/api/fields/data_source_fields.py
@@ -24,8 +24,6 @@ integrate_notion_info_list_fields = {
     "notion_info": fields.List(fields.Nested(integrate_workspace_fields)),
 }
 
-integrate_icon_fields = {"type": fields.String, "url": fields.String, "emoji": fields.String}
-
 integrate_page_fields = {
     "page_name": fields.String,
     "page_id": fields.String,