diff --git a/app/Http/Controllers/EventController.php b/app/Http/Controllers/EventController.php
index 6bf5fb62..7442b288 100644
--- a/app/Http/Controllers/EventController.php
+++ b/app/Http/Controllers/EventController.php
@@ -146,7 +146,11 @@ class EventController extends Controller
                         }
                     }
 
-                    $course->user_id = $instructor;
+                    if ($instructor == null) {
+                        $course->user_id = '';
+                    } else {
+                        $course->user_id = $instructor;
+                    }
                     if (request('location_n'.$l.'_p'.$p) != null) {
                         $course->location = request('location_n'.$l.'_p'.$p);
                     } else {
@@ -159,8 +163,16 @@ class EventController extends Controller
 
                     if(\request("use_course_n".$l."_p".$p) == 'on')
                     {
-                        $course->name = request('name_n'.$l.'_p'.$p);
-                        $course->ocom = request('ocom_n'.$l.'_p'.$p);
+                        if (request('name_n'.$l.'_p'.$p) == null) {
+                            $course->name = "";
+                        } else {
+                            $course->name = request('name_n'.$l.'_p'.$p);
+                        }
+                        if (request('ocom_n'.$l.'_p'.$p) == null) {
+                            $course->ocom = "";
+                        } else {
+                            $course->ocom = request('ocom_n'.$l.'_p'.$p);
+                        }
                         $course->desc = "";
                     }
                     else
@@ -334,8 +346,16 @@ class EventController extends Controller
                             $instructor = $user->id;
                         }
                     }
-                    $course->user_id = $instructor;
-                    $course->location = request('location_n'.$l.'_p'.$p);
+                    if ($instructor == null) {
+                        $course->user_id = "";
+                    } else {
+                        $course->user_id = $instructor;
+                    }
+                    if (request('location_n'.$l.'_p'.$p) == null) {
+                        $course->location = "";
+                    } else {
+                        $course->location = request('location_n'.$l.'_p'.$p);
+                    }
                     $course->periode = $p;
                     $course->level = $l;