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-rw-r--r--crawl-ref/source/cloud.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/crawl-ref/source/cloud.cc b/crawl-ref/source/cloud.cc
index ceaa07c0c0..f4986f7e7c 100644
--- a/crawl-ref/source/cloud.cc
+++ b/crawl-ref/source/cloud.cc
@@ -478,6 +478,8 @@ void move_cloud_to(coord_def src, coord_def dst)
// that clouds get moved along with the rest of the map.
void move_cloud(int cloud, const coord_def& newpos)
{
+ ASSERT(!cell_is_solid(newpos));
+
if (cloud != EMPTY_CLOUD)
{
const coord_def oldpos = env.cloud[cloud].pos;