diff --git a/system/scripts/actors/base-sheet.js b/system/scripts/actors/base-sheet.js
index 935d699..5ab1b2e 100644
--- a/system/scripts/actors/base-sheet.js
+++ b/system/scripts/actors/base-sheet.js
@@ -133,6 +133,11 @@ export class BaseSheetL5r5e extends ActorSheet {
                         }).render(true);
                         return;
                     }
+
+                    // No cost for schools
+                    item.data.data.xp_cost = 0;
+                    item.data.data.xp_used = 0;
+                    item.data.data.in_curriculum = true;
                 } else {
                     // Check if technique is allowed for this character
                     if (!game.user.isGM && !this.actor.data.data.techniques[item.data.data.technique_type]) {
@@ -148,15 +153,15 @@ export class BaseSheetL5r5e extends ActorSheet {
                         }).render(true);
                         return;
                     }
+
+                    // Verify cost
+                    item.data.data.xp_cost =
+                        item.data.data.xp_cost > 0 ? item.data.data.xp_cost : CONFIG.l5r5e.xp.techniqueCost;
+                    item.data.data.xp_used = item.data.data.xp_cost;
                 }
 
                 // Modify the bought at rank to the current actor rank
                 item.data.data.bought_at_rank = this.actor.data.data.identity.school_rank;
-
-                // Verify cost
-                item.data.data.xp_cost =
-                    item.data.data.xp_cost > 0 ? item.data.data.xp_cost : CONFIG.l5r5e.xp.techniqueCost;
-                item.data.data.xp_used = item.data.data.xp_cost;
                 break;
         }
 
diff --git a/system/scripts/helpers.js b/system/scripts/helpers.js
index f2df415..5971ffe 100644
--- a/system/scripts/helpers.js
+++ b/system/scripts/helpers.js
@@ -55,7 +55,11 @@ export class HelpersL5r5e {
      * Return the target object on a drag n drop event, or null if not found
      */
     static async getDragnDropTargetObject(event) {
-        const data = JSON.parse(event.dataTransfer.getData("text/plain"));
+        const json = event.dataTransfer.getData("text/plain");
+        if (!json) {
+            return null;
+        }
+        const data = JSON.parse(json);
         return await HelpersL5r5e.getObjectGameOrPack(data.id, data.type, data.pack);
     }