diff --git a/developer/src/kmc-convert/src/converter-messages.ts b/developer/src/kmc-convert/src/converter-messages.ts
index 9a4ac0d96c..a2bcd79683 100644
--- a/developer/src/kmc-convert/src/converter-messages.ts
+++ b/developer/src/kmc-convert/src/converter-messages.ts
@@ -7,7 +7,7 @@ import { CompilerErrorNamespace, CompilerErrorSeverity, CompilerMessageSpec as m
 
 const Namespace = CompilerErrorNamespace.Converter;
 //const SevInfo = CompilerErrorSeverity.Info | Namespace;
-// const SevHint = CompilerErrorSeverity.Hint | Namespace;
+ const SevHint = CompilerErrorSeverity.Hint | Namespace;
 const SevWarn = CompilerErrorSeverity.Warn | Namespace;
 const SevError = CompilerErrorSeverity.Error | Namespace;
 // const SevFatal = CompilerErrorSeverity.Fatal | Namespace;
@@ -82,5 +82,10 @@ export class ConverterMessages {
     this.WARN_EmptyOutput,
     `Key has empty output (possibly caused by use of html entity) at keyMap index ${def(o.keymapIndex)} on Keycode ${def(o.key)} (${def(o.KeyName)})`
   );
+  static HINT_EmptyOutput = SevHint | 0x000E;
+  static Hint_EmptyOutput =(o: { keymapIndex: string, key: string, KeyName: string; }) => m(
+    this.HINT_EmptyOutput,
+    `Key has empty output at keyMap index ${def(o.keymapIndex)} on Keycode ${def(o.key)} (${def(o.KeyName)}) possibly caused by use of html entity `
+  );
 
 }
diff --git a/developer/src/kmc-convert/src/keylayout-to-kmn/keylayout-to-kmn-converter.ts b/developer/src/kmc-convert/src/keylayout-to-kmn/keylayout-to-kmn-converter.ts
index 258aa2d045..85052f9acc 100644
--- a/developer/src/kmc-convert/src/keylayout-to-kmn/keylayout-to-kmn-converter.ts
+++ b/developer/src/kmc-convert/src/keylayout-to-kmn/keylayout-to-kmn-converter.ts
@@ -234,18 +234,7 @@ export class KeylayoutToKmnConverter {
           // ...............e. g. <key code="1" output="s"/> ...............................................................................
           // ...............................................................................................................................
 
-          if (jsonObj.keyboard.keyMapSet[0].keyMap[i].key[j]['output'] === "") {
-            /* this.callbacks.reportMessage(ConverterMessages.Warn_EmptyOutput({
-             keymapIndex: jsonObj.keyboard.keyMapSet[0].keyMap[i]['index'],
-             key: jsonObj.keyboard.keyMapSet[0].keyMap[i].key[j]['code'],
-             KeyName: this.mapUkeleleKeycodeToVK(Number(jsonObj.keyboard.keyMapSet[0].keyMap[i].key[j]['code']))
-           }));
-           return null;*/
-            console.log('Empty output');
-
-          }
-          else if (jsonObj.keyboard.keyMapSet[0].keyMap[i].key[j]['output'] !== undefined) {
-
+         if (jsonObj.keyboard.keyMapSet[0].keyMap[i].key[j]['output'] !== undefined) {
 
             // loop modifiers
             for (let l = 0; l < dataUkelele.modifiers[i].length; l++) {
diff --git a/developer/src/kmc-convert/src/keylayout-to-kmn/kmn-file-writer.ts b/developer/src/kmc-convert/src/keylayout-to-kmn/kmn-file-writer.ts
index 5d4b8d311d..7c8f5800bc 100644
--- a/developer/src/kmc-convert/src/keylayout-to-kmn/kmn-file-writer.ts
+++ b/developer/src/kmc-convert/src/keylayout-to-kmn/kmn-file-writer.ts
@@ -96,14 +96,15 @@ export class KmnFileWriter {
     // (e.g. when in a keylayout file the same modifiers occur in several behaviors thus producing the same rules).
     // This is to filter out those duplicate Rule objects
     const uniqueDataRules: Rule[] = dataUkelele.rules.filter((curr) => {
-      return (!(curr.output.length === 0 || curr.output === undefined)
+      return (!(curr.output === undefined)
         && (curr.key !== "")
         && ((curr.ruleType === "C0")
           || (curr.ruleType === "C1")
           || (curr.ruleType === "C2" && (curr.deadkey !== ""))
           || (curr.ruleType === "C3" && (curr.deadkey !== "") && (curr.prevDeadkey !== "")))
       );
-    }).reduce<Rule[]>((unique, o) => {
+    }).reduce((unique, o) => {
+
       if (!unique.some((obj: Rule) =>
         new TextDecoder().decode(obj.output) === new TextDecoder().decode(o.output)
 
@@ -1619,10 +1620,12 @@ export class KmnFileWriter {
   */
   public writeCharacterOrUnicode(ctr: string, msg: string = ""): MessageCharacter {
 
-    if ((ctr === null) || (ctr === undefined) || (ctr.length === 0)) {
-      return { character: '', message: '' };
+    if ((ctr === null) || (ctr === undefined)) {
+      return null;
     }
 
+    let msg_control = '';
+    let msg_entity = '';
     let versionOutputCharacter;
     const out: MessageCharacter = {
       message: msg,
@@ -1644,6 +1647,10 @@ export class KmnFileWriter {
             : KeylayoutToKmnConverter.MAX_CTRL_CHARACTER
     );
 
+    if (ctr.length === 0) {
+      msg_entity = "empty output or unsupported numerical html entity: ";
+    }
+
     // for control characters in 'U+...', '&#x...' or '&#...' format as well as in "" format
     if ((ctr_val < KeylayoutToKmnConverter.MAX_CTRL_CHARACTER) || (ctr.charCodeAt(0) < KeylayoutToKmnConverter.MAX_CTRL_CHARACTER)) {
 
@@ -1658,17 +1665,21 @@ export class KmnFileWriter {
       if (versionOutputCharacter)
         out.character = versionOutputCharacter;
 
-      // add a warning message
-      if (msg == "") {
-        out.message = "c WARNING: use of a control character ";
-      }
-      else {
-        out.message = msg + "; Use of a control character ";
-      }
+      msg_control = "Use of a control character ";
     }
     else {
       out.character = this.convertToUnicodeCharacter(ctr) ?? "";
     }
+
+    // add a warning message
+    if (msg !== "") {
+      msg = msg + msg_control + msg_entity;
+    }
+    if ((msg === "") && (msg_entity !== "" || msg_control !== "")) {
+      msg = "c WARNING: " + msg_entity + msg_control;
+    }
+    out.message = msg;
+
     return out;
   }
 
diff --git a/developer/src/kmc-convert/test/keylayout-to-kmn-converter.tests.ts b/developer/src/kmc-convert/test/keylayout-to-kmn-converter.tests.ts
index 32a861a996..54b2c3d3ae 100644
--- a/developer/src/kmc-convert/test/keylayout-to-kmn-converter.tests.ts
+++ b/developer/src/kmc-convert/test/keylayout-to-kmn-converter.tests.ts
@@ -42,6 +42,7 @@ describe('KeylayoutToKmnConverter', function () {
       ['../data/Test_ambiguous_keys.keylayout'],
       ['../data/Test_differentEncodings.keylayout'],
       ['../data/Test_ExtraWarning.keylayout'],
+      ['../data/Test_characters.keylayout'],
     ].forEach(function (files) {
       it(files + " should give no errors ", async function () {
         await sut.run(makePathToFixture(files[0]));
@@ -61,10 +62,11 @@ describe('KeylayoutToKmnConverter', function () {
         sut.run(makePathToFixture(files[0]));
        // assert.isTrue(compilerTestCallbacks.messages.length === 1 && compilerTestCallbacks.messages[0].code === 5292037);
         assert.isTrue(compilerTestCallbacks.messages.length === 0);
-      });
-    });
-  });
-
+        await sut.run(makePathToFixture(files[0]));
+        assert.equal(compilerTestCallbacks.messages.length, 0);
+       });
+     });
+   });
   describe('RunTestFiles resulting in errors ', function () {
     const sut = new KeylayoutToKmnConverter(compilerTestCallbacks, compilerTestOptions);
     [
@@ -79,7 +81,6 @@ describe('KeylayoutToKmnConverter', function () {
       ['../data/Test_MissingActionsERROR.keylayout'],
       ['../data/Test_MissingTerminatorsERROR.keylayout'],
       ['../data/Test_MissingAllERROR.keylayout'],
-      // ['../data/Test_characters.keylayout'],
     ].forEach(function (files) {
       it(files + " should give an error ", async function () {
         await sut.run(makePathToFixture(files[0]));
@@ -95,7 +96,7 @@ describe('KeylayoutToKmnConverter', function () {
       ['../data/Test_undefinedAction.keylayout'],
     ].forEach(function (files) {
       it(files + " should give Error: undefined action detected", async function () {
-        await sut.run(makePathToFixture(files[0]));
+         sut.run(makePathToFixture(files[0]));
         assert.equal(compilerTestCallbacks.messages.length, 1);
         assert.equal(compilerTestCallbacks.messages[0].code, 5292040);
       });