diff --git a/ui-ngx/src/app/core/services/calculated-field-form.service.ts b/ui-ngx/src/app/core/services/calculated-field-form.service.ts
index 673b97abe4..1b9dddfd26 100644
--- a/ui-ngx/src/app/core/services/calculated-field-form.service.ts
+++ b/ui-ngx/src/app/core/services/calculated-field-form.service.ts
@@ -101,7 +101,12 @@ export class CalculatedFieldFormService {
       return this.calculatedFieldsService.getLatestCalculatedFieldDebugEvent(calculatedFieldId, {ignoreLoading: true})
         .pipe(
           switchMap(event => {
-            const args = event?.arguments ? JSON.parse(event.arguments) : null;
+            let args = null;
+            if (event?.arguments) {
+              try {
+                args = JSON.parse(event.arguments);
+              } catch (e) {}
+            }
             return testDialogFn(formValue, args, false, expression);
           }),
           takeUntilDestroyed(destroyRef)
@@ -109,4 +114,4 @@ export class CalculatedFieldFormService {
     }
     return testDialogFn(formValue, null, false, expression);
   }
-}
\ No newline at end of file
+}