diff --git a/packages/server/src/server/plugins/compiler.ts b/packages/server/src/server/plugins/compiler.ts
index 33d2429d86..829acd1862 100644
--- a/packages/server/src/server/plugins/compiler.ts
+++ b/packages/server/src/server/plugins/compiler.ts
@@ -113,6 +113,9 @@ class PluginCompiler {
             const error = reply.issues ? new ZodError(reply.issues) : reply.error;
             if (reply.errors) Object.assign(error, { errors: reply.errors });
             if (reply.warnings) Object.assign(error, { warnings: reply.warnings });
+            // Promise.all can reject while the other target is still compiling.
+            // Retire the isolate before another request can enter it.
+            this.stopWorker(worker);
             reject(error);
           }
         };