diff --git a/create-report.sh b/create-report.sh
index 0b01a50..05f5ae5 100755
--- a/create-report.sh
+++ b/create-report.sh
@@ -5,14 +5,14 @@ set -eu
 echo 'Retrieving Flake information' >&2
 flake_info=$(nix flake show --json 2>/dev/null)
 packages=$(
-	jq --raw-output '.packages."x86_64-linux" | keys[]' <<-EOF
+	jq --raw-output '.packages."x86_64-linux" | select(. != null) | keys[]' <<-EOF
 		$flake_info
 	EOF
 )
 echo "Packages:" >&2
 echo "$packages" >&2
 configurations=$(
-	jq --raw-output '.nixosConfigurations | keys[]' <<-EOF
+	jq --raw-output '.nixosConfigurations | select(. != null) | keys[]' <<-EOF
 		$flake_info
 	EOF
 )
@@ -67,4 +67,4 @@ markdown() {
 	EOF
 }
 
-markdown > size-report.md
+markdown >size-report.md