diff --git a/htdocs/core/class/html.formadmin.class.php b/htdocs/core/class/html.formadmin.class.php
index 8e03f158a02..13619fe5aa3 100644
--- a/htdocs/core/class/html.formadmin.class.php
+++ b/htdocs/core/class/html.formadmin.class.php
@@ -73,6 +73,18 @@ class FormAdmin
 
 		$langs_available = $langs->get_available_languages(DOL_DOCUMENT_ROOT, 12, 0, $mainlangonly);
 
+		// If the language to select is not inside the list of available language and empty value is not available, we must find
+		// an alternative as the language code to pre-select (to avoid to have first element in list pre-selected).
+		if ($selected && !in_array($selected, $langs_available) && empty($showempty)) {
+			$tmparray = explode('_', $selected);
+			if (!empty($tmparray[1])) {
+				$selected = getLanguageCodeFromCountryCode($tmparray[1]);
+			}
+			if (empty($selected)) {
+				$selected = $langs->defaultlang;
+			}
+		}
+
 		$out = '';
 
 		$out .= '<select '.($multiselect ? 'multiple="multiple" ' : '').'class="flat'.($morecss ? ' '.$morecss : '').'" id="'.$htmlname.'" name="'.$htmlname.($multiselect ? '[]' : '').'"'.($disabled ? ' disabled' : '').'>';
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index 26ce4d7c5b1..3ae97098a79 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -8192,8 +8192,8 @@ function picto_from_langcode($codelang, $moreatt = '')
  * Return default language from country code.
  * Return null if not found.
  *
- * @param 	string 	$countrycode	Country code like 'US', 'FR', 'CA', 'ES', 'MX', ...
- * @return	string					Value of locale like 'en_US', 'fr_FR', ...
+ * @param 	string 	$countrycode	Country code like 'US', 'FR', 'CA', 'ES', 'IN', 'MX', ...
+ * @return	string					Value of locale like 'en_US', 'fr_FR', ... or null if not found
  */
 function getLanguageCodeFromCountryCode($countrycode)
 {
@@ -8243,12 +8243,12 @@ function getLanguageCodeFromCountryCode($countrycode)
 		'ar-SY',
 		'ar-TN',
 		'ar-YE',
-		'as-IN',
+		//'as-IN',		// Moved after en-IN
 		'ba-RU',
 		'be-BY',
 		'bg-BG',
 		'bn-BD',
-		'bn-IN',
+		//'bn-IN',		// Moved after en-IN
 		'bo-CN',
 		'br-FR',
 		'ca-ES',
@@ -8269,6 +8269,8 @@ function getLanguageCodeFromCountryCode($countrycode)
 		'en-GB',
 		'en-IE',
 		'en-IN',
+		'as-IN',	// as-IN must be after en-IN (en in priority if country is IN)
+		'bn-IN',	// bn-IN must be after en-IN (en in priority if country is IN)
 		'en-JM',
 		'en-MY',
 		'en-NZ',
@@ -8406,7 +8408,7 @@ function getLanguageCodeFromCountryCode($countrycode)
 			$locale_language = locale_get_primary_language($locale);
 			$locale_region = locale_get_region($locale);
 			if (strtoupper($countrycode) == $locale_region) {
-				//var_dump($locale.'-'.$locale_language.'-'.$locale_region);
+				//var_dump($locale.' - '.$locale_language.' - '.$locale_region);
 				return strtolower($locale_language).'_'.strtoupper($locale_region);
 			}
 		}