diff --git a/vot/tracker/__init__.py b/vot/tracker/__init__.py
index 8170955..7f99fcc 100644
--- a/vot/tracker/__init__.py
+++ b/vot/tracker/__init__.py
@@ -826,7 +826,7 @@ def __init__(self, runtime: TrackerRuntime):
         """
 
         super().__init__(runtime.tracker)
-        if self._runtime.multiobject:
+        if runtime.multiobject:
             self._runtime = runtime
         else:
             self._runtime = [runtime]