diff --git a/src/engine/parsers/cache/CacheParserUtil.java b/src/engine/parsers/cache/CacheParserUtil.java
index 026322d6..13fbda6a 100644
--- a/src/engine/parsers/cache/CacheParserUtil.java
+++ b/src/engine/parsers/cache/CacheParserUtil.java
@@ -35,7 +35,7 @@ public class CacheParserUtil {
     public static File[] listJsonFiles(String folderPath) {
 
         File folder = new File(folderPath);
-        File[] jsonFiles = folder.listFiles((dir, name) -> name.endsWith(".json"));
+        File[] jsonFiles = folder.listFiles((dir, name) -> name.endsWith(".json") && hasTemplateId(name));
 
         if (jsonFiles == null) {
             Logger.error("Cache folder not found: " + folder.getAbsolutePath());
@@ -45,6 +45,22 @@ public class CacheParserUtil {
         return jsonFiles;
     }
 
+    // Template ids are 32-bit. The client cache has RUNE/10788957847552, which is
+    // 2512 << 32 (the Huntress id in the high word); files like it are skipped.
+
+    private static boolean hasTemplateId(String fileName) {
+
+        String idText = fileName.substring(0, fileName.length() - ".json".length());
+
+        try {
+            Integer.parseInt(idText);
+            return true;
+        } catch (NumberFormatException e) {
+            Logger.warn("Skipping " + fileName + ": name is not a 32-bit template id");
+            return false;
+        }
+    }
+
     public static int templateIdFromFile(File jsonFile) {
 
         String fileName = jsonFile.getName();