diff --git a/classes/context/Context.class.php b/classes/context/Context.class.php
index b5986153f..e96936c30 100644
--- a/classes/context/Context.class.php
+++ b/classes/context/Context.class.php
@@ -928,7 +928,7 @@ class Context {
 					$v = stripslashes($v);
 				}
 
-				$val[$k] = trim($v);
+				if (is_string($v)) $val[$k] = trim($v);
 			}
 		}