1 files changed, 1 insertions, 1 deletions
diff --git a/js/Misc/generic_block.js b/js/Misc/generic_block.js
index cfe26859..12e9bfcf 100644
--- a/js/Misc/generic_block.js
+++ b/js/Misc/generic_block.js
@@ -82,7 +82,7 @@ function generic_block() {
                 throw "user error";
                 var ok = false;
             }
-            if ([[this.ci],[this.co]]!=[]) {
+            if ([[this.ci],[this.co]].length!=0) {
                 if (max([[this.ci],[this.co]])>1) {
                     message("vector event links not supported");
                     throw "user error";