diff --git a/api/src/controllers/internal/Execution.ts b/api/src/controllers/internal/Execution.ts
index d97d1be..c488d95 100644
--- a/api/src/controllers/internal/Execution.ts
+++ b/api/src/controllers/internal/Execution.ts
@@ -38,6 +38,7 @@ export class ExecutionController {
     const session = await sessionController.getSession()
     console.log('using session', session.id)
     session.inUse = true
+    session.consumed = true
 
     const logPath = path.join(session.path, 'log.log')
 
diff --git a/api/src/controllers/internal/Session.ts b/api/src/controllers/internal/Session.ts
index 21ca22c..525a072 100644
--- a/api/src/controllers/internal/Session.ts
+++ b/api/src/controllers/internal/Session.ts
@@ -34,7 +34,7 @@ export class SessionController {
   }
 
   private getReadySessions = (): Session[] =>
-    this.sessions.filter((sess: Session) => sess.ready)
+    this.sessions.filter((sess: Session) => sess.ready && !sess.consumed)
 
   private async createSession(): Promise<Session> {
     const sessionId = generateUniqueFileName(generateTimestamp())
@@ -52,6 +52,7 @@ export class SessionController {
       id: sessionId,
       ready: false,
       inUse: false,
+      consumed: false,
       completed: false,
       creationTimeStamp,
       deathTimeStamp,
diff --git a/api/src/types/Session.ts b/api/src/types/Session.ts
index cf3e490..0507a6d 100644
--- a/api/src/types/Session.ts
+++ b/api/src/types/Session.ts
@@ -5,6 +5,7 @@ export interface Session {
   deathTimeStamp: string
   path: string
   inUse: boolean
+  consumed: boolean
   completed: boolean
   crashed?: string
 }