From bec03361ad07310b1172b98c0fb4d78148fb845c Mon Sep 17 00:00:00 2001
From: Martin Krulis <krulis@ksi.mff.cuni.cz>
Date: Mon, 15 Apr 2019 12:12:54 +0200
Subject: [PATCH] Fixing bug in exercise config form.

---
 .../EditExerciseSimpleConfigTestCompilation.js | 18 ++++++++++++------
 1 file changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/components/forms/EditExerciseSimpleConfigForm/EditExerciseSimpleConfigTestCompilation.js b/src/components/forms/EditExerciseSimpleConfigForm/EditExerciseSimpleConfigTestCompilation.js
index 96ac16f70..d27448cfa 100644
--- a/src/components/forms/EditExerciseSimpleConfigForm/EditExerciseSimpleConfigTestCompilation.js
+++ b/src/components/forms/EditExerciseSimpleConfigForm/EditExerciseSimpleConfigTestCompilation.js
@@ -49,14 +49,20 @@ class EditExerciseSimpleConfigTestCompilation extends Component {
     if (!extraFiles && !jarFiles) {
       return false;
     }
-    for (const files of Object.values(extraFiles)) {
-      if (files && files.length > 0) {
-        return true;
+
+    if (extraFiles) {
+      for (const files of Object.values(extraFiles)) {
+        if (files && files.length > 0) {
+          return true;
+        }
       }
     }
-    for (const files of Object.values(jarFiles)) {
-      if (files && files.length > 0) {
-        return true;
+
+    if (jarFiles) {
+      for (const files of Object.values(jarFiles)) {
+        if (files && files.length > 0) {
+          return true;
+        }
       }
     }
     return false;