diff --git a/app/utils/normalise-data.js b/app/utils/normalise-data.js
index 2de8b9b..0b3e9dd 100644
--- a/app/utils/normalise-data.js
+++ b/app/utils/normalise-data.js
@@ -29,7 +29,7 @@ export default function normaliseData(data, highestDate) {
   let lastValue;
   normalisedKeys.forEach(key => {
     if(data[key]) {
-      lastValue = data[key].length
+      lastValue = Array.isArray(data[key]) ? data[key].length : data[key]
     }
     output[key] = lastValue;
   })
diff --git a/cli.js b/cli.js
index 47ca6d2..7142924 100755
--- a/cli.js
+++ b/cli.js
@@ -37,6 +37,17 @@ async function list(lttfPlugins, previousResultsPath) {
     }
   }
 
+  // Squash old entries
+  for (let date in previousResults) {
+    for (let plugin in previousResults[date]) {
+      for (let rule in previousResults[date][plugin]) {
+        if (Array.isArray(previousResults[date][plugin][rule])) {
+          previousResults[date][plugin][rule] = previousResults[date][plugin][rule].length;
+        }
+      }
+    }
+  }
+
   let today = new Date();
   let isoDate = today.toISOString().split('T')[0];