Fix prerequisite edition BT#15494

main/lp/learnpath.class.php

@@ -1557,7 +1557,7 @@ class learnpath
         $id = (int) $id;
         $prerequisite_id = (int) $prerequisite_id;
 
-        if (empty($id) || empty($prerequisite_id)) {
+        if (empty($id)) {
             return false;
         }
 
@@ -1569,13 +1569,15 @@ class learnpath
             $maxScore = 100;
         }
 
+        $minScore = floatval($minScore);
+        $maxScore = floatval($maxScore);
+
         if (empty($prerequisite_id)) {
             $prerequisite_id = 'NULL';
+            $minScore = 0;
+            $maxScore = 100;
         }
 
-        $minScore = floatval($minScore);
-        $maxScore = floatval($maxScore);
-
         $tbl_lp_item = Database::get_course_table(TABLE_LP_ITEM);
         $sql = " UPDATE $tbl_lp_item
                  SET