diff --git a/owlps-positioner/src/outputtcpsocketevaal.cc b/owlps-positioner/src/outputtcpsocketevaal.cc
index 45ffb49..0f5d35c 100644
--- a/owlps-positioner/src/outputtcpsocketevaal.cc
+++ b/owlps-positioner/src/outputtcpsocketevaal.cc
@@ -77,8 +77,9 @@ bool OutputTCPSocketEvAAL::init_socket()
  */
 void OutputTCPSocketEvAAL::write(const ResultList &results)
 {
-  assert(results.get_results().size() == 1) ;
-  write(results.get_results()[0]) ;
+  assert(results.get_results().size() <= 1) ;
+  if (! results.get_results().empty())
+    write(results.get_results()[0]) ;
 }