fix: yield not set calculation error

CHANGELOG.md

@@ -17,6 +17,8 @@
   [#2015](https://github.com/nextcloud/cookbook/pull/2015) @seyfeb
 - Prevent recalculation algorithm if no yield is given
   [#2003](https://github.com/nextcloud/cookbook/pull/2003) @j0hannesr0th
+- Fix yield not set calculation error
+  [#2099](https://github.com/nextcloud/cookbook/pull/2099) @j0hannesr0th
 
 ### Documentation
 - Improve  structure of `README.md`

src/components/RecipeView/RecipeView.vue

@@ -184,7 +184,7 @@
                             <span class="icon-error" />
                             {{
                                 // prettier-ignore
-                                t("cookbook", "The ingredient cannot be recalculated due to incorrect syntax. Please change it to this syntax: amount unit ingredient. Examples: 200 g carrots or 1 pinch of salt")
+                                t("cookbook", "The ingredient cannot be recalculated due to incorrect syntax. Please ensure the syntax follows this format: amount unit ingredient and that a specific number of portions is set for this function to work correctly. Examples: 200 g carrots or 1 pinch of salt.")
                             }}
                         </div>
                     </section>

src/js/yieldCalculator.js

@@ -41,6 +41,10 @@ function recalculateIngredients(ingredients, currentYield, originalYield) {
             return ingredient;
         }
 
+        if (!Number.isInteger(originalYield) || originalYield < 1) {
+            return ingredient;
+        }
+
         const matches = ingredient.match(fractionRegExp);
 
         if (matches) {