X-Git-Url: https://main.carlh.net/gitweb/?p=dcpomatic.git;a=blobdiff_plain;f=src%2Ftools%2Fdcpomatic_kdm.cc;fp=src%2Ftools%2Fdcpomatic_kdm.cc;h=12fa614ccabce6f3423336d5ed668eeb5eeef9d8;hp=5393a7fd17476ad0a5cb02da25bbe55c7b49f7bd;hb=575932b8dccb30a02e0cc140b52aede72828a69a;hpb=395d753b81bce0c5ca32f5662eb959d915ebdcdc

diff --git a/src/tools/dcpomatic_kdm.cc b/src/tools/dcpomatic_kdm.cc
index 5393a7fd1..12fa614cc 100644
--- a/src/tools/dcpomatic_kdm.cc
+++ b/src/tools/dcpomatic_kdm.cc
@@ -527,6 +527,15 @@ private:
 			group = to->second->parent();
 		}
 
+		/* Check we're not adding a group to one of its children */
+		auto to_parent = group;
+		while (to_parent) {
+			if (from->second == to_parent) {
+				return;
+			}
+			to_parent = to_parent->parent();
+		}
+
 		DCPOMATIC_ASSERT (group);
 		DCPOMATIC_ASSERT (from->second->parent ());