diff --git a/.gitignore b/.gitignore
index 21d30e5..86f2bcd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,4 @@ input.xml
 output.json
 dump.xml
 pdata.json
+dump.bin
diff --git a/src/controllers/gitadora/user.ts b/src/controllers/gitadora/user.ts
index 0a3e9b4..4c3ca4e 100644
--- a/src/controllers/gitadora/user.ts
+++ b/src/controllers/gitadora/user.ts
@@ -185,7 +185,7 @@ export class User {
                 for (const seq in m.seqs) {
                   const rec = m.seqs[seq];
                   if (rec.skill > bestScore) {
-                    bestScore = rec.skill;
+                    bestScore = rec.skill % 10000;
                     bestSeq = +seq;
                   }
 
diff --git a/src/utils/kbinxml.ts b/src/utils/kbinxml.ts
index 8b3f39b..b4716f6 100644
--- a/src/utils/kbinxml.ts
+++ b/src/utils/kbinxml.ts
@@ -168,6 +168,10 @@ function serializeValue(value: any, type: string): string {
   }
 
   if (['str', 'string'].includes(type)) {
+    if (!value.replace) {
+      return 'null';
+    }
+
     return value.replace(/[<>&'"]/g, (ch: string) => {
       switch (ch) {
         case '<': return '&lt;';