diff --git a/dist/index.js b/dist/index.js
index b94e575..0a1e2e3 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1501,7 +1501,7 @@ async function run() {
         if (!build) {
           core.error(`Could not find build matching version ${version}.`);
           core.setFailed(`No existing build for app ID ${appId} matches version ${version}`);
-          return;
+          throw new Error(`Unexpected build status: "${status}" yet no matching build found`);
         }
         core.info(`Found build matching version ${version} OK: ${JSON.stringify(build)}`);
 
diff --git a/index.js b/index.js
index fc2d3c5..10a8a4e 100644
--- a/index.js
+++ b/index.js
@@ -125,7 +125,7 @@ async function run() {
         if (!build) {
           core.error(`Could not find build matching version ${version}.`);
           core.setFailed(`No existing build for app ID ${appId} matches version ${version}`);
-          return;
+          throw new Error(`Unexpected build status: "${status}" yet no matching build found`);
         }
         core.info(`Found build matching version ${version} OK: ${JSON.stringify(build)}`);