diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/view.js b/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
index d3c9340d8..031cf651e 100755
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/view.js
@@ -2335,6 +2335,7 @@ RED.view = (function() {
     var textDimensionPlaceholder = {};
     var textDimensionCache = {};
     function calculateTextDimensions(str,className) {
+        var cacheKey = "!"+str;
         if (!textDimensionPlaceholder[className]) {
             textDimensionPlaceholder[className] = document.createElement("span");
             textDimensionPlaceholder[className].className = className;
@@ -2343,15 +2344,15 @@ RED.view = (function() {
             document.getElementById("red-ui-editor").appendChild(textDimensionPlaceholder[className]);
             textDimensionCache[className] = {};
         } else {
-            if (textDimensionCache[className][str]) {
-                return textDimensionCache[className][str]
+            if (textDimensionCache[className][cacheKey]) {
+                return textDimensionCache[className][cacheKey]
             }
         }
         textDimensionPlaceholder[className].textContent = (str||"");
         var w = textDimensionPlaceholder[className].offsetWidth;
         var h = textDimensionPlaceholder[className].offsetHeight;
-        textDimensionCache[className][str] = [w,h];
-        return textDimensionCache[className][str];
+        textDimensionCache[className][cacheKey] = [w,h];
+        return textDimensionCache[className][cacheKey];
     }
 
     function convertLineBreakCharacter(str) {