diff --git a/src/js/cmdline.js b/src/js/cmdline.js
index f74e9fb..9a21d3d 100644
--- a/src/js/cmdline.js
+++ b/src/js/cmdline.js
@@ -48,6 +48,8 @@ for(var i = 1; i < ARGV.length; i++) {
 		if(pmake.options[args[0]]) {
 			var opts = pmake.options[args[0]].options;
 
+			if(!opts) opts = [];
+
 			if(opts) {
 				if((typeof opts) == "function") opts = opts();
 			}
@@ -55,7 +57,7 @@ for(var i = 1; i < ARGV.length; i++) {
 			if(opts && !args[1]) {
 				console.log("Error: no value specified for option '" + args[0] + "'");
 				process.exit(1);
-			} else if(opts && !opts.includes(args[1])) {
+			} else if(opts.length > 0 && !opts.includes(args[1])) {
 				console.log("Error: invalid value '" + args[1] + "' for option '" + args[0] + "'");
 				process.exit(1);
 			} else if(opts) {