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-rw-r--r--lib/modules.nix3
1 files changed, 2 insertions, 1 deletions
diff --git a/lib/modules.nix b/lib/modules.nix
index daffe5224ab2d..1d2c4a1acbb53 100644
--- a/lib/modules.nix
+++ b/lib/modules.nix
@@ -104,7 +104,8 @@ rec {
                 file = def.file;
                 value = setAttrByPath def.prefix def.value;
               }) merged.unmatchedDefns;
-            in declaredConfig._module.freeformType.merge prefix defs;
+            in if defs == [] then {}
+            else declaredConfig._module.freeformType.merge prefix defs;
 
         in if declaredConfig._module.freeformType == null then declaredConfig
           # Because all definitions that had an associated option ended in