diff --git a/Assemblies/1SettingsHelper.dll b/Assemblies/1SettingsHelper.dll
index a11a867..2b430e0 100644
Binary files a/Assemblies/1SettingsHelper.dll and b/Assemblies/1SettingsHelper.dll differ
diff --git a/Assemblies/ExpandedRoofing.dll b/Assemblies/ExpandedRoofing.dll
index 305f29b..dbdaaf1 100644
Binary files a/Assemblies/ExpandedRoofing.dll and b/Assemblies/ExpandedRoofing.dll differ
diff --git a/Source/ExpandedRoofing/SolarRoofingTracker.cs b/Source/ExpandedRoofing/SolarRoofingTracker.cs
index 9de310a..a841a06 100644
--- a/Source/ExpandedRoofing/SolarRoofingTracker.cs
+++ b/Source/ExpandedRoofing/SolarRoofingTracker.cs
@@ -94,7 +94,7 @@ public void AddSolarCell(IntVec3 cell)
                     for (int i = 1; i < found.Count; i++)
                     {
                         cellSets[mergerKey].UnionWith(cellSets[found.ElementAt(i)]);
-                        cellSets.Remove(i);
+                        cellSets.Remove(found.ElementAt(i));
                     }
                     break;
             }