diff --git a/src/core/Ingredient.mjs b/src/core/Ingredient.mjs
index 319dfb15..ab276fc0 100755
--- a/src/core/Ingredient.mjs
+++ b/src/core/Ingredient.mjs
@@ -99,8 +99,6 @@ class Ingredient {
      * @param {string} type - The name of the data type.
     */
     static prepare(data, type) {
-        let number;
-
         switch (type) {
             case "binaryString":
             case "binaryShortString":
@@ -116,7 +114,9 @@ class Ingredient {
                 }
             case "number":
                 if (data === null) return data;
-                number = parseFloat(data);
+                if (isNaN(data)) throw "Ingredient can not be empty.";
+
+                let number = parseFloat(data);
                 if (isNaN(number)) {
                     const sample = Utils.truncate(data.toString(), 10);
                     throw "Invalid ingredient value. Not a number: " + sample;