Don't crash when the map group cannot be found.

1 files changed, 2 insertions, 0 deletions

diff --git a/gis-observation-map b/gis-observation-map
index fbd9146..c1ac22e 100755
--- a/gis-observation-map
+++ b/gis-observation-map
@@ -879,6 +879,8 @@ if args.topo_basedir is not None and projectInstance is not None:
         for topo in topo_maps:
             minScale = None
             rootGroup = QgsProject.instance().layerTreeRoot().findGroup(topo)
+            if rootGroup is None:
+                continue
             if topo in idxContains.keys() and not idxContains[topo]:
                 # if the tileset doesn't entirely covers the area of interest,
                 # then uncheck the layer group and disable scale-based visibility