diff --git a/static/js/services/build/build.service.impl.ts b/static/js/services/build/build.service.impl.ts
index 5648efe28..ace6ef7fd 100644
--- a/static/js/services/build/build.service.impl.ts
+++ b/static/js/services/build/build.service.impl.ts
@@ -81,6 +81,10 @@ export class BuildServiceImpl implements BuildService {
         message = 'This build was previously cancelled.';
         break;
 
+      case 'incomplete':
+        message = 'This build was not completed.';
+        break;
+
       default:
         throw new Error(`Invalid build phase: ${phase.toString()}`);
     }