diff --git a/htdocs/admin/system/web.php b/htdocs/admin/system/web.php
index 93af0097087..921fd839109 100644
--- a/htdocs/admin/system/web.php
+++ b/htdocs/admin/system/web.php
@@ -70,9 +70,14 @@ if ($labeluser && $labelgroup) {
 if (function_exists('exec')) {
 	$arrayout = array(); $varout = 0;
 	exec('id', $arrayout, $varout);
+	print '<tr><td>'.$langs->trans("WebUserGroup")." (real, 'id' command)</td><td>";
 	if (empty($varout)) {	// Test command is ok. Work only on Linux OS.
-		print '<tr><td>'.$langs->trans("WebUserGroup")." (real, 'id' command)</td><td>".join(',', $arrayout)."</td></tr>\n";
+		print join(',', $arrayout);
+	} else {
+		$langs->load("errors");
+		print '<span class="opacitymedium">'.$langs->trans("ErrorExecIdFailed").'</span>';
 	}
+	print "</td></tr>\n";
 }
 print '</table>';
 print '</div>';
diff --git a/htdocs/langs/en_US/errors.lang b/htdocs/langs/en_US/errors.lang
index 114654aed3f..c51414e6833 100644
--- a/htdocs/langs/en_US/errors.lang
+++ b/htdocs/langs/en_US/errors.lang
@@ -270,6 +270,7 @@ ErrorActionCommBadType=Selected event type (id: %n, code: %s) do not exist in Ev
 CheckVersionFail=Version check fail
 ErrorWrongFileName=Name of the file cannot have __SOMETHING__ in it
 ErrorNotInDictionaryPaymentConditions=Not in Payment Terms Dictionary, please modify.
+ErrorExecIdFailed=Can't execute command "id"
 
 # Warnings
 WarningParamUploadMaxFileSizeHigherThanPostMaxSize=Your PHP parameter upload_max_filesize (%s) is higher than PHP parameter post_max_size (%s). This is not a consistent setup.