Index: uspace/lib/c/generic/async/server.c
===================================================================
--- uspace/lib/c/generic/async/server.c	(revision bd9e868109273fe333c36fad00976f58740dbb8b)
+++ uspace/lib/c/generic/async/server.c	(revision 32766821f962dd52667a4e0a472a4b8aa98347c8)
@@ -1199,6 +1199,6 @@
 		atomic_dec(&threads_in_ipc_wait);
 
-		assert(rc == EOK);
-		handle_call(&call);
+		if (rc == EOK)
+			handle_call(&call);
 	}