diff --git a/tools/json/json.php b/tools/json/json.php
index 811e858f0..6e48eac6a 100644
--- a/tools/json/json.php
+++ b/tools/json/json.php
@@ -766,7 +766,7 @@ class Services_JSON
     function isError($data, $code = null)
     {
         if (class_exists('pear')) {
-            return PEAR::isError($data, $code);
+            return @PEAR::isError($data, $code);
         } elseif (is_object($data) && (get_class($data) == 'services_json_error' ||
                                  is_subclass_of($data, 'services_json_error'))) {
             return true;
@@ -801,4 +801,4 @@ if (class_exists('PEAR_Error')) {
         }
     }
 
-}
\ No newline at end of file
+}