diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 875e44e..3764740 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -1576,7 +1576,7 @@
 						cause_message, f);
 				}
 			}
-			if (context) {
+			else if (context) {
 				res = PySet_Contains(seen, context);
 				if (res == -1)
 					PyErr_Clear();