diff --git a/index.js b/index.js
index 61dbc53..48ad37c 100644
--- a/index.js
+++ b/index.js
@@ -19,6 +19,7 @@ let AdminUsersUid = ["asyncnomi", "johan", "enthalpine", "fas", "arina", "billy"
 let UsersToken = {};
 let TokenDurationSecond = 3600;
 let MaxAmountCrepe = 10;
+let Supplements = ["nature", "sucre", "nutella", "confiture"];
 
 var ldapConf = JSON.parse(fs.readFileSync("ldap-conf.json"));
 var LDAP = new LdapAuth({
@@ -115,13 +116,26 @@ fastify.post('/addPrank', async (request, reply) => {
                     if ("where" in content
                     && "amount" in content
                     && "supplement" in content) {
-                        if (amound < MaxAmountCrepe) {
+                        let amount = parseInt(content.amount)
+                        if (isNaN(amount)) {
+                            return {
+                                success: false,
+                                why: "Unable to parse the amount as integer"
+                            }
+                        }
+                        if (!Supplements.contains(content.supplement)) {
+                            return {
+                                success: false,
+                                why: "This supplement isn't available"
+                            }
+                        }
+                        if (amount < MaxAmountCrepe) {
                             let prankUid = makeid(16);
                             PrankData[prankUid] = {
                                 creator: content.uid,
                                 type: content.type,
                                 where: content.where,
-                                amount: content.amount,
+                                amount: amount,
                                 supplement: content.supplement,
                                 note: content.note,
                                 state: "Pending",