Index: branches/5.2.x/core/kernel/utility/logger.php
===================================================================
--- branches/5.2.x/core/kernel/utility/logger.php
+++ branches/5.2.x/core/kernel/utility/logger.php
@@ -549,6 +549,9 @@
 					$ret[$key] = 'Class: ' . get_class($value);
 				}
 			}
+			elseif ( is_resource($value) ) {
+				$ret[$key] = (string)$value;
+			}
 			elseif ( strlen($value) > 200 ) {
 				$ret[$key] = substr($value, 0, 50) . ' ...';
 			}