diff --git a/src/session.c b/src/session.c
index eb6820b6..50bad8be 100644
--- a/src/session.c
+++ b/src/session.c
@@ -830,8 +830,7 @@ SR_API int sr_session_start(struct sr_session *session)
 		lend = l->next;
 		for (l = session->devs; l != lend; l = l->next) {
 			sdi = l->data;
-			if (sdi->driver->dev_acquisition_stop)
-				sdi->driver->dev_acquisition_stop(sdi);
+			sdi->driver->dev_acquisition_stop(sdi);
 		}
 		/* TODO: Handle delayed stops. Need to iterate the event
 		 * sources... */