diff --git a/src/sequences/Formula.ts b/src/sequences/Formula.ts
index 31c515fe..e6bab02f 100644
--- a/src/sequences/Formula.ts
+++ b/src/sequences/Formula.ts
@@ -2,7 +2,7 @@ import {Cached} from './Cached'
 import {SequenceExportModule} from './SequenceInterface'
 
 import {math, MathFormula} from '@/shared/math'
-import type {GenericParamDescription} from '@/shared/Paramable'
+import type {ParamValues, GenericParamDescription} from '@/shared/Paramable'
 import {ParamType} from '@/shared/ParamType'
 
 /** md
@@ -114,6 +114,11 @@ class Formula extends Cached(paramDesc) {
         this.name = formulaMark + this.formula.source
     }
 
+    assignParameters(realized?: ParamValues<GenericParamDescription>) {
+        this.nErrors = 0
+        return super.assignParameters(realized)
+    }
+
     calculate(n: bigint) {
         let result = 0
         let resultType = ''