diff --git a/plugins/remotefortressreader/remotefortressreader.cpp b/plugins/remotefortressreader/remotefortressreader.cpp
index 3b62a7783..91ebc0d55 100644
--- a/plugins/remotefortressreader/remotefortressreader.cpp
+++ b/plugins/remotefortressreader/remotefortressreader.cpp
@@ -1785,9 +1785,12 @@ static command_result GetUnitListInside(color_ostream &stream, const BlockReques
                 switch (action->type)
                 {
                 case unit_action_type::Move:
-                    send_unit->set_subpos_x(lerp(0, unit->path.path.x[0] - unit->pos.x, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
-                    send_unit->set_subpos_y(lerp(0, unit->path.path.y[0] - unit->pos.y, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
-                    send_unit->set_subpos_z(lerp(0, unit->path.path.z[0] - unit->pos.z, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
+                    if (unit->path.path.x.size() > 0)
+                    {
+                        send_unit->set_subpos_x(lerp(0, unit->path.path.x[0] - unit->pos.x, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
+                        send_unit->set_subpos_y(lerp(0, unit->path.path.y[0] - unit->pos.y, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
+                        send_unit->set_subpos_z(lerp(0, unit->path.path.z[0] - unit->pos.z, (float)(action->data.move.timer_init - action->data.move.timer) / action->data.move.timer_init));
+                    }
                     break;
                 default:
                     break;