diff --git a/src/vim9expr.c b/src/vim9expr.c
index 7b8c96a..b765448 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -406,7 +406,7 @@
 	    }
 	}
 
-	if (is_super && IS_ABSTRACT_METHOD(ufunc))
+	if (is_super && ufunc != NULL && IS_ABSTRACT_METHOD(ufunc))
 	{
 	    // Trying to invoke an abstract method in a super class is not
 	    // allowed.