diff --git a/kiss/src/kiss/CompilerTools.hx b/kiss/src/kiss/CompilerTools.hx
index 2a0759b9..bfb05c2f 100644
--- a/kiss/src/kiss/CompilerTools.hx
+++ b/kiss/src/kiss/CompilerTools.hx
@@ -190,7 +190,7 @@ class CompilerTools {
         }
 
         // return an expression for a lambda that calls new Process() that runs the target-specific file
-        var callingCode = 'function (?inputLines:Array<String>) { return kiss.Prelude.assertProcess("$command", [haxe.io.Path.join(["${args.outputFolder}", "$mainClassName.$scriptExt"])].concat(inputLines)); }';
+        var callingCode = 'function (?inputLines:Array<String>) { if (inputLines == null) inputLines = []; return kiss.Prelude.assertProcess("$command", [haxe.io.Path.join(["${args.outputFolder}", "$mainClassName.$scriptExt"])].concat(inputLines)); }';
         #if test
         trace(callingCode);
         #end