Fix #5020

src/check_type.cpp

@@ -2082,7 +2082,9 @@ gb_internal Type *check_get_params(CheckerContext *ctx, Scope *scope, Ast *_para
 					if (type != t_invalid && !check_is_assignable_to(ctx, &op, type, allow_array_programming)) {
 						bool ok = true;
 						if (p->flags&FieldFlag_any_int) {
-							if ((!is_type_integer(op.type) && !is_type_enum(op.type)) || (!is_type_integer(type) && !is_type_enum(type))) {
+							if (op.type == nullptr) {
+								ok = false;
+							} else if ((!is_type_integer(op.type) && !is_type_enum(op.type)) || (!is_type_integer(type) && !is_type_enum(type))) {
 								ok = false;
 							} else if (!check_is_castable_to(ctx, &op, type)) {
 								ok = false;