diff --git a/module/item/item-sheet.js b/module/item/item-sheet.js
index 258977e..87b7dd2 100644
--- a/module/item/item-sheet.js
+++ b/module/item/item-sheet.js
@@ -40,6 +40,12 @@ export class BoLItemSheet extends ItemSheet {
         }
       }
       if (itemData.data.category == 'spell') {
+        if(!itemData.data.properties.mandatoryconditions) {
+          itemData.data.properties.mandatoryconditions = []
+        }
+        if(!itemData.data.properties.optionnalconditions) {
+          itemData.data.properties.optionnalconditions = []
+        }
         for (let i = 0; i < 4; i++) {
           itemData.data.properties.mandatoryconditions[i] = itemData.data.properties.mandatoryconditions[i] ?? ""
         }
diff --git a/system.json b/system.json
index 3c80388..ca50f45 100644
--- a/system.json
+++ b/system.json
@@ -7,7 +7,7 @@
   "url": "https://github.com/ZigmundKreud/bol",
   "license": "LICENSE.txt",
   "flags": {},
-  "version": "0.9.1.4",
+  "version": "0.9.1.5",
   "templateVersion": 18,
   "minimumCoreVersion": "0.8.6",
   "compatibleCoreVersion": "9",