diff --git a/src/run.go b/src/run.go
index bd3f28d..4982983 100644
--- a/src/run.go
+++ b/src/run.go
@@ -216,7 +216,7 @@ func runVal(line any, stack stack, stacklevel int) (any, ArErr) {
 			break
 		}
 		return runTryCatch(x, stack, stacklevel+1)
-	case bool, ArObject, number, nil:
+	case bool, ArObject, number, nil, Callable:
 		return x, ArErr{}
 	}
 	if stackoverflow {
diff --git a/src/variable.go b/src/variable.go
index 74b5362..125d12a 100644
--- a/src/variable.go
+++ b/src/variable.go
@@ -275,7 +275,13 @@ func setVariableValue(v setVariable, stack stack, stacklevel int) (any, ArErr) {
 			case ArObject:
 				if _, ok := y.obj["__setindex__"]; ok {
 					callable := y.obj["__setindex__"]
-					builtinCall(callable, []any{key, resp})
+					_, err := runCall(call{
+						callable: callable,
+						args:     []any{key, resp},
+						line:     v.line,
+						path:     v.path,
+						code:     v.code,
+					}, stack, stacklevel+1)
 					if err.EXISTS {
 						return nil, err
 					}