1 files changed, 1 insertions, 1 deletions
diff --git a/src/ste/STECore.php b/src/ste/STECore.php
index a53e652..595228b 100644
--- a/src/ste/STECore.php
+++ b/src/ste/STECore.php
@@ -123,7 +123,7 @@ class STECore
                     throw new RuntimeError("Can not call tag \"$name\": Does not exist.");
                 }
             }
-            return call_user_func($this->tags[$name], $this, $params, $sub);
+            return (string)call_user_func($this->tags[$name], $this, $params, $sub);
         } catch (RuntimeError $e) {
             if (!$this->mute_runtime_errors) {
                 return "RuntimeError occurred on tag '$name': " . $e->getMessage();