diff --git a/static/js/data.js b/static/js/data.js
index 2ca22751..aeb4ee7c 100644
--- a/static/js/data.js
+++ b/static/js/data.js
@@ -235,7 +235,9 @@ class dataFileBase {
       })
       if (ex2 !== undefined) {
         if (DebugMode.Enabled) {
-          console.assert(ex.type == 0 || (ex2.type ^ (excitationTypes.Rydberg | excitationTypes.Valence) == ex.type ^ (excitationTypes.Rydberg | excitationTypes.Valence)), "Excitation type error", [ex, ex2, data.sourceFile])
+          const restflag=ex.type.Value & ex2.type.Value
+          const result=restflag==ex.type.Value
+          console.assert(result, "Excitation type error", [ex, ex2, this.sourceFile])
         }
         ex.type = ex2.type
       }