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-rw-r--r--overrides/default.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/overrides/default.nix b/overrides/default.nix
index ebc187cf..e2531051 100644
--- a/overrides/default.nix
+++ b/overrides/default.nix
@@ -63,8 +63,8 @@ let
   # derivation overrides
   drvOverrides = mapOverride overrideDerivation argOverrides {
     gajim = o: {
-      patches = o.patches ++ singleton gajimPatch;
-      postPatch = o.postPatch + ''
+      patches = (o.patches or []) ++ singleton gajimPatch;
+      postPatch = (o.postPatch or "") + ''
         sed -i -e '/^export/i export GTK2_RC_FILES="${gajimGtkTheme}"' \
           scripts/gajim.in
       '';