diff --git a/samples/window_manager.dcfg b/samples/window_manager.dcfg
index da82e21..478b92a 100644
--- a/samples/window_manager.dcfg
+++ b/samples/window_manager.dcfg
@@ -1,8 +1,8 @@
 fn lib = {
 	keybindings = [
-		{ key = 'Main-Shift-Escape' action = lib.quit_wm }
-		{ key = 'Main-Shift-Q' action = lib.kill_application }
-		{ key = 'Main-Shift-C' action = lib.close_application }
+		{ key = 'Main-Shift-Escape' action = (lib.quit_wm) }
+		{ key = 'Main-Shift-Q' action = (lib.kill_application) }
+		{ key = 'Main-Shift-C' action = (lib.close_application) }
 		{ key = 'Main-Space' action = (lib.execute 'alacritty') }
 	]
 }
diff --git a/src/dcfg.c b/src/dcfg.c
index 56a59f7..55ff59a 100644
--- a/src/dcfg.c
+++ b/src/dcfg.c
@@ -1984,6 +1984,7 @@ bool dcfg_Value_evaluate_in_env(
 	}
 	if (!ret) {
 		dcfg_destroy(*out_value);
+		*out_value = NULL;
 	}
 	return ret;
 }