diff --git a/UI/WebServerResources/MailerUI.js b/UI/WebServerResources/MailerUI.js
index 7f6054370..6e4d62e04 100644
--- a/UI/WebServerResources/MailerUI.js
+++ b/UI/WebServerResources/MailerUI.js
@@ -527,12 +527,14 @@ function quotasCallback(http) {
       && http.status == 200) {
     var hasQuotas = false;
 
-    var quotas = http.responseText.evalJSON(true);
-    for (var i in quotas) {
-      hasQuotas = true;
-      break;
+    if (http.responseText.length > 0) {
+      var quotas = http.responseText.evalJSON(true);
+      for (var i in quotas) {
+	hasQuotas = true;
+	break;
+      }
     }
-
+    
     if (hasQuotas) {
       var treePath = currentMailbox.split("/");
       var quotasMB = new Array();