diff --git a/src/lang/en.json b/src/lang/en.json
index 4a1ed8da..90e15bdc 100644
--- a/src/lang/en.json
+++ b/src/lang/en.json
@@ -329,5 +329,6 @@
   "OSE.error.noTokenControlled": "You must have one or more controlled Tokens in order to use this option.",
   "OSE.error.noGP": "You need a GP item to use this feature.",
   "OSE.error.unexpectedSettings": "unexpected OSE setting {configName}: {configValue}",
-  "OSE.error.cantDealDamageTo": "Can't deal damage to {nameOrId}"
+  "OSE.error.cantDealDamageTo": "Can't deal damage to {nameOrId}",
+  "OSE.error.notMemorized": "The spell {name} is not memorized."
 }
diff --git a/src/module/item/entity.js b/src/module/item/entity.js
index 087d3566..12c81c4a 100644
--- a/src/module/item/entity.js
+++ b/src/module/item/entity.js
@@ -185,11 +185,19 @@ export default class OseItem extends Item {
       );
 
     const itemData = this.system;
-    await this.update({
-      system: {
-        cast: itemData.cast - 1,
-      },
-    });
+
+    if (itemData.cast > 0) {
+      await this.update({
+        system: {
+          cast: itemData.cast - 1,
+        },
+      });
+    } else {
+      return ui.notifications.error(
+        game.i18n.format("OSE.error.notMemorized", {
+          name: this.name,
+        }));
+    };
 
     if (itemData.roll) {
       await this.rollFormula()