diff --git a/p__Classrooms__Lists__Exercise__Detail__index.async.js b/p__Classrooms__Lists__Exercise__Detail__index.async.js
index 58a9200254..4cacaf50c8 100644
--- a/p__Classrooms__Lists__Exercise__Detail__index.async.js
+++ b/p__Classrooms__Lists__Exercise__Detail__index.async.js
@@ -628,7 +628,7 @@ var Knowledge = function Knowledge(_ref) {
                     });
                     // values.push(res.tag_discipline_id)
                     // value.push(res.tag_discipline_id)
-                    _value2 = selectvalues;
+                    _value2 = selectvalues || [];
                     _value2.push(res.tag_discipline_id);
                     onChange(toConsumableArray_default()(_value2));
                     setValues(toConsumableArray_default()(_value2));
diff --git a/p__Problems__OjForm__NewEdit__index.async.js b/p__Problems__OjForm__NewEdit__index.async.js
index 535caa4767..ec0645b294 100644
--- a/p__Problems__OjForm__NewEdit__index.async.js
+++ b/p__Problems__OjForm__NewEdit__index.async.js
@@ -2172,7 +2172,7 @@ var Knowledge = function Knowledge(_ref) {
                     });
                     // values.push(res.tag_discipline_id)
                     // value.push(res.tag_discipline_id)
-                    _value2 = selectvalues;
+                    _value2 = selectvalues || [];
                     _value2.push(res.tag_discipline_id);
                     onChange(toConsumableArray_default()(_value2));
                     setValues(toConsumableArray_default()(_value2));
diff --git a/p__Problems__OjForm__index.async.js b/p__Problems__OjForm__index.async.js
index f70e6d847e..838860b577 100644
--- a/p__Problems__OjForm__index.async.js
+++ b/p__Problems__OjForm__index.async.js
@@ -2255,7 +2255,7 @@ var Knowledge = function Knowledge(_ref) {
                     });
                     // values.push(res.tag_discipline_id)
                     // value.push(res.tag_discipline_id)
-                    _value2 = selectvalues;
+                    _value2 = selectvalues || [];
                     _value2.push(res.tag_discipline_id);
                     onChange(toConsumableArray_default()(_value2));
                     setValues(toConsumableArray_default()(_value2));
diff --git a/p__Problemset__NewItem__index.async.js b/p__Problemset__NewItem__index.async.js
index 3060557a38..a2322031a3 100644
--- a/p__Problemset__NewItem__index.async.js
+++ b/p__Problemset__NewItem__index.async.js
@@ -2172,7 +2172,7 @@ var Knowledge = function Knowledge(_ref) {
                     });
                     // values.push(res.tag_discipline_id)
                     // value.push(res.tag_discipline_id)
-                    _value2 = selectvalues;
+                    _value2 = selectvalues || [];
                     _value2.push(res.tag_discipline_id);
                     onChange(toConsumableArray_default()(_value2));
                     setValues(toConsumableArray_default()(_value2));