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-rw-r--r--src/group_cmd.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/group_cmd.cpp b/src/group_cmd.cpp
index 59b799d9e..63e8f99fe 100644
--- a/src/group_cmd.cpp
+++ b/src/group_cmd.cpp
@@ -373,7 +373,7 @@ void SetTrainGroupID(Train *v, GroupID new_g)
{
if (!Group::IsValidID(new_g) && !IsDefaultGroupID(new_g)) return;
- assert(v->IsFrontEngine());
+ assert(v->IsFrontEngine() || IsDefaultGroupID(new_g));
for (Vehicle *u = v; u != NULL; u = u->Next()) {
if (u->IsEngineCountable()) UpdateNumEngineGroup(u->engine_type, u->group_id, new_g);