diff --git a/static/js/data.js b/static/js/data.js
index 51c37645..d7ac3210 100644
--- a/static/js/data.js
+++ b/static/js/data.js
@@ -202,7 +202,7 @@ class excitationBase {
     if (this.type.Value == 0) {
       this.type.Value = excitationTypes.Others.Value;
     }
-    else (!(this.type & (excitationTypes.Single.Value | excitationTypes.Double.Value))){
+    else if (!(this.type & (excitationTypes.Single.Value | excitationTypes.Double.Value))){
       this.type.Value = excitationTypes.Single
     }
     this.T1 = T1