diff --git a/src/group_gui.cpp b/src/group_gui.cpp
index 1ecb8172b2..807039133d 100644
--- a/src/group_gui.cpp
+++ b/src/group_gui.cpp
@@ -40,7 +40,7 @@ static void BuildGroupList(grouplist_d* gl, PlayerID owner, VehicleType vehicle_
 	const Group *g;
 	uint n = 0;
 
-	if (!(gl->l.flags & VL_REBUILD)) return;
+	if (!(gl->l.flags & VL_REBUILD) || GetGroupArraySize() == 0) return;
 
 	list = MallocT<const Group*>(GetGroupArraySize());
 	if (list == NULL) {