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-rw-r--r--src/mapgen/mapgen_valleys.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/mapgen/mapgen_valleys.cpp b/src/mapgen/mapgen_valleys.cpp
index c4234857e..80a99b1f0 100644
--- a/src/mapgen/mapgen_valleys.cpp
+++ b/src/mapgen/mapgen_valleys.cpp
@@ -57,7 +57,8 @@ FlagDesc flagdesc_mapgen_valleys[] = {
MapgenValleys::MapgenValleys(MapgenValleysParams *params, EmergeParams *emerge)
: MapgenBasic(MAPGEN_VALLEYS, params, emerge)
{
- // NOTE: MapgenValleys has a hard dependency on BiomeGenOriginal
+ FATAL_ERROR_IF(biomegen->getType() != BIOMEGEN_ORIGINAL,
+ "MapgenValleys has a hard dependency on BiomeGenOriginal");
m_bgen = (BiomeGenOriginal *)biomegen;
spflags = params->spflags;