better error handling in js

diff --git a/templates/script.ts b/templates/script.ts
index d32ef39093d87ea1d8d66085b7daa747abfc5f4d..2ee10ea1b7bc81e103d08f6ac478ba9893c3185e 100644 (file)
--- a/templates/script.ts
+++ b/templates/script.ts
@@ -616,9 +616,9 @@ function startup() {
       }
       gen = tgen;
     } catch (exc) {
+      var s = exc.toString();
       string_report_error('exception handling update '
-                         + k + ': ' + JSON.stringify(m) + ': ' +
-                         + exc.toString());
+                         + k + ': ' + JSON.stringify(m) + ': ' + s);
     }
   }
   es.addEventListener('commsworking', function(event) {