diff --git a/src/module/dialog/spellDialog.mjs b/src/module/dialog/spellDialog.mjs
index efc1fa02..f4ac417d 100644
--- a/src/module/dialog/spellDialog.mjs
+++ b/src/module/dialog/spellDialog.mjs
@@ -182,16 +182,19 @@ export class SpellDialog extends HandlebarsApplicationMixin(ApplicationV2) {
     }
 
     normalizeCastingCost() {
-
         let costFormula = this._costModel.additionalFormula
+        if (costFormula) {
 
-        this._costModel.variables.forEach(v => {
+            this._costModel.variables.forEach(v => {
 
-            costFormula = costFormula.replace(v, this._costMutators[v])
+                costFormula = costFormula.replace(v, this._costMutators[v])
 
-        })
+            })
 
-        costFormula = Number(eval(costFormula)) + Number(this._costModel.cost)
+            costFormula = Number(eval(costFormula)) + Number(this._costModel.cost)
+        } else {
+            costFormula = this._costModel.cost
+        }
         if (costFormula <= this._costModel.min) {
             costFormula = this._costModel.min
         }