diff --git a/communication_techniques/src/communication/common.c b/communication_techniques/src/communication/common.c
index 900f027..76193b4 100644
--- a/communication_techniques/src/communication/common.c
+++ b/communication_techniques/src/communication/common.c
@@ -52,8 +52,10 @@ int init_producer_thread(void)
 	thread_num = get_thread_number();
 	if (init_thread_comm(&tcomms[thread_num]))
 	{
+		pthread_mutex_lock(&init_lock);
 		error = 1;
 		pthread_cond_signal(&init_cond);
+		pthread_mutex_unlock(&init_lock);
 		return -1;
 	}
 	pthread_mutex_lock(&init_lock);