diff --git a/plugins/Full_CI_ZMQ/run_selection_slave.irp.f b/plugins/Full_CI_ZMQ/run_selection_slave.irp.f
index cbc62ee4..3a9f7a96 100644
--- a/plugins/Full_CI_ZMQ/run_selection_slave.irp.f
+++ b/plugins/Full_CI_ZMQ/run_selection_slave.irp.f
@@ -59,8 +59,8 @@ subroutine run_selection_slave(thread,iproc,energy)
       end do
       if(ctask > 0) then
         call sort_selection_buffer(buf)
-        call push_selection_results(zmq_socket_push, pt2, buf, task_id(1), ctask)
         call merge_selection_buffers(buf,buf2)
+        call push_selection_results(zmq_socket_push, pt2, buf, task_id(1), ctask)
         buf%mini = buf2%mini
         pt2 = 0d0
         buf%cur = 0
diff --git a/plugins/Full_CI_ZMQ/selection_buffer.irp.f b/plugins/Full_CI_ZMQ/selection_buffer.irp.f
index 33deb7ac..4dd0f90a 100644
--- a/plugins/Full_CI_ZMQ/selection_buffer.irp.f
+++ b/plugins/Full_CI_ZMQ/selection_buffer.irp.f
@@ -64,6 +64,10 @@ subroutine merge_selection_buffers(b1, b2)
   i2=1
   do while (b1%val(b1%cur) > b2%mini)
     b1%cur = b1%cur-1
+    if (b1%cur == 0) then
+      b1%cur = 1
+      return
+    endif
   enddo
   do i=1,nmwen
     if ( (i1 > b1%cur).and.(i2 > b2%cur) ) then