diff --git a/src/worker/tools/sdcc.ts b/src/worker/tools/sdcc.ts
index e665edfb..65b622f0 100644
--- a/src/worker/tools/sdcc.ts
+++ b/src/worker/tools/sdcc.ts
@@ -146,6 +146,9 @@ export function linkSDLDZ80(step: BuildStep) {
         args.push.apply(args, step.args);
         //console.log(args);
         execMain(step, LDZ80, args);
+        if (errors.length) {
+            return { errors: errors };
+        }
         var hexout = FS.readFile("main.ihx", { encoding: 'utf8' });
         var noiout = FS.readFile("main.noi", { encoding: 'utf8' });
         putWorkFile("main.ihx", hexout);