diff --git a/static/js/data.js b/static/js/data.js
index 7f49ad8b..fda7daeb 100644
--- a/static/js/data.js
+++ b/static/js/data.js
@@ -347,7 +347,7 @@ class dataFileBase {
         }
       });
       console.assert(double.length === 0, "Double found", double, dat.molecule, dat.method.toString())
-      if (dat.DOI.string !== "10.1021/acs.jctc.8b01205") {
+      if (dat.DOI!== null && dat.DOI.string !== "10.1021/acs.jctc.8b01205") {
         for (const ex of dat.excitations) {
           console.assert(Number.isNaN(ex.T1.valueOf()) | ex.T1 > 50 | ex.isUnsafe == true, "Must be unsafe", dat, ex)
         }