1 files changed, 2 insertions, 0 deletions
diff --git a/js/NonLinear/PRODUCT.js b/js/NonLinear/PRODUCT.js
index 77f9b79e..a4db3880 100644
--- a/js/NonLinear/PRODUCT.js
+++ b/js/NonLinear/PRODUCT.js
@@ -32,6 +32,7 @@ function PRODUCT() {
             if (size(this.sgn,1)==1) {
                 if (this.sgn<1) {
                     message("Number of inputs must be > 0");
+                    throw "user error";
                     var ok = false;
                 } else if (this.sgn==1) {
                     var in1 = -1;
@@ -45,6 +46,7 @@ function PRODUCT() {
             } else {
                 if (!and(abs(this.sgn)==1)) {
                     message("Signs can only be +1 or -1");
+                    throw "user error";
                     var ok = false;
                 } else {
                     var in1 = -ones(size(this.sgn,1),1);