prevent null values setState

src/pages/Dictionaries.tsx

@@ -75,13 +75,17 @@ const Dictionaries = () => {
       <Select
         data={dictionaryOptions}
         value={selectedDictionary}
-        onChange={setSelectedDictionary} 
+        onChange={(value) => {
+          if (value) {
+            setSelectedDictionary(value)
+          }
+        }}
         allowDeselect={false}
         searchable
         nothingFoundMessage="Не найдено..."
         maxDropdownHeight={300}
-     /><br/>
-      <Button onClick={() => { setCurrentItem(null); setModalOpened(true); }}>Добавить</Button><br/><br/>
+      /><br />
+      <Button onClick={() => { setCurrentItem(null); setModalOpened(true); }}>Добавить</Button><br /><br />
 
       <DictionaryTable
         data={data}