diff --git a/docs/examples/i18n/example1.js b/docs/examples/i18n/example1.js
index 6f97e6e1a..16967ff0e 100644
--- a/docs/examples/i18n/example1.js
+++ b/docs/examples/i18n/example1.js
@@ -65,7 +65,9 @@ const config = {
   licenseKey: 'gpl-v3',
 };
 
-HyperFormula.registerLanguage('enUS', enUS);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('enUS')) {
+  HyperFormula.registerLanguage('enUS', enUS);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty(config);
diff --git a/docs/examples/i18n/example1.ts b/docs/examples/i18n/example1.ts
index 4b48b0c7c..a59236f60 100644
--- a/docs/examples/i18n/example1.ts
+++ b/docs/examples/i18n/example1.ts
@@ -67,7 +67,9 @@ const config = {
   licenseKey: 'gpl-v3',
 };
 
-HyperFormula.registerLanguage('enUS', enUS);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('enUS')) {
+  HyperFormula.registerLanguage('enUS', enUS);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty(config);
diff --git a/docs/examples/localizing-functions/example1.js b/docs/examples/localizing-functions/example1.js
index 0b9af1d2b..d7388ac47 100644
--- a/docs/examples/localizing-functions/example1.js
+++ b/docs/examples/localizing-functions/example1.js
@@ -28,7 +28,9 @@ const tableData = [
 ];
 
 // register language
-HyperFormula.registerLanguage('frFR', frFR);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('frFR')) {
+  HyperFormula.registerLanguage('frFR', frFR);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty({
diff --git a/docs/examples/localizing-functions/example1.ts b/docs/examples/localizing-functions/example1.ts
index 2a827bed4..daa70fe05 100644
--- a/docs/examples/localizing-functions/example1.ts
+++ b/docs/examples/localizing-functions/example1.ts
@@ -30,7 +30,9 @@ const tableData = [
 ];
 
 // register language
-HyperFormula.registerLanguage('frFR', frFR);
+if (!HyperFormula.getRegisteredLanguagesCodes().includes('frFR')) {
+  HyperFormula.registerLanguage('frFR', frFR);
+}
 
 // Create an empty HyperFormula instance.
 const hf = HyperFormula.buildEmpty({