diff --git a/utils/lib.js b/utils/lib.js
index 96629c5..11c63cb 100644
--- a/utils/lib.js
+++ b/utils/lib.js
@@ -4,10 +4,10 @@ console.log('Load lib module');
 
 function compare(a, b, operator) {
     // Hint: a = currentState, b = targetState
-    let logMsg = a + ', ' + b + ' with operator ' + operator;
+    let logMsg = '';
     let returnValue = undefined;
     try {
-        logMsg = 'Quantity comparison of ' + logMsg;
+        logMsg = 'Quantity comparison of ' + a + ', ' + b + ' with operator ' + operator;
         switch (operator)  {
             case '==':
                 returnValue = a.equal(b);
@@ -29,7 +29,7 @@ function compare(a, b, operator) {
                 break;
         }
     } catch(e) {
-        logMsg = 'Standard comparison of ' + logMsg;
+        logMsg = 'Standard comparison of ' + a + ', ' + b + ' with operator ' + operator;
         switch (operator) {
             case '==':
                 returnValue = (a == b);