diff --git a/public/mathWorker.js b/public/mathWorker.js
index 03309e6..5a9c121 100644
--- a/public/mathWorker.js
+++ b/public/mathWorker.js
@@ -221,8 +221,7 @@ function formatResult(result) {
 function processExpression(expression) {
     // returns an object with isError and result properties
     const result = calc(expression.source)
-    const visible = expression.source.trim().endsWith(';') ? false :
-        result.value === undefined ? false : true
+    const visible = (result && result.value !== undefined && result.value.isResultSet && result.value.entries.length == 0) ? false : true
 
     if (result.isError) {
         return { type: "error", result: result.value, visible }