Uncaught TypeError: e.split is not a function when migrating from 2.12.6 to 2.13.1

**Checklist**
- Have you pulled and found the error with `jc21/nginx-proxy-manager:latest` docker image?
  - Yes
- Are you sure you're not using someone else's docker image?
  - Yes
- Have you searched for similar issues (both open and closed)?
  - Yes

**Describe the bug**
After updating from version 2.12.6 to 2.13.1, when accessing some sections, no content is displayed and a JavaScript error is generated.


**Nginx Proxy Manager Version**
2.13.1


**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Proxy Host' or 'Certificates'
2. It does not display content and a JavaScript error is generated.


**Screenshots**
<img width="1671" height="738" alt="Image" src="https://github.com/user-attachments/assets/c2a49582-7883-45af-a50f-766748f12097" />


**Operating System**
linux x86_64 Debian GNU/Linux 13 (trixie)
Docker: 28.5.1 (API: 1.51)


**Additional context**
I have tested with Firefox and Chrome, both in normal and private sessions.

Error JS:
```
Uncaught TypeError: e.split is not a function
    $M https://iproxy.domain.local/assets/index-BBAG1AZl.js:126
    z8 https://iproxy.domain.local/assets/index-BBAG1AZl.js:126
    pE https://iproxy.domain.local/assets/index-BBAG1AZl.js:126
    p https://iproxy.domain.local/assets/DomainsFormatter-DRGLydBn.js:1
    ld https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    M0 https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    nS https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    LS https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    aI https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    tg https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    xS https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    qS https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    Ad https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    GS https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    dI https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    dI https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    Li https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ar https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    iT https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    aT https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    batchCalls https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    n https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    u https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    u https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    a https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    u https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    setTimeout handler*uR https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    u https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    batch https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    #i https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    setData https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    fetch https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    #d https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    onSubscribe https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    subscribe https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    UR https://iproxy.domain.local/assets/index-BBAG1AZl.js:50
    aT https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    bd https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    ES https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
    si https://iproxy.domain.local/assets/index-BBAG1AZl.js:49
index-BBAG1AZl.js:126:13026
```

Console Docker:
```
-------------------------------------
User:  npm PUID:0 ID:0 GROUP:0
Group: npm PGID:0 ID:0
-------------------------------------
❯ Starting nginx ...
❯ Starting backend ...
nginx: [warn] the "listen ... http2" directive is deprecated, use the "http2" directive instead in /data/nginx/proxy_host/32.conf:19
nginx: [warn] the "listen ... http2" directive is deprecated, use the "http2" directive instead in /data/nginx/redirection_host/1.conf:15
nginx: [warn] protocol options redefined for 0.0.0.0:443 in /data/nginx/redirection_host/1.conf:15
nginx: [warn] protocol options redefined for 0.0.0.0:443 in /data/nginx/redirection_host/2.conf:15
nginx: [warn] the "listen ... http2" directive is deprecated, use the "http2" directive instead in /data/nginx/dead_host/1.conf:15
nginx: [warn] protocol options redefined for 0.0.0.0:443 in /data/nginx/dead_host/1.conf:15
[11/5/2025] [9:06:11 AM] [Global   ] › ℹ  info      Using Sqlite: /data/database.sqlite
[11/5/2025] [9:06:11 AM] [Global   ] › ⬤  debug     Checking for keys file: /data/keys.json
[11/5/2025] [9:06:11 AM] [Global   ] › ℹ  info      Keys file exists OK
[11/5/2025] [9:06:11 AM] [Migrate  ] › ℹ  info      Current database version: none
[11/5/2025] [9:06:11 AM] [Global   ] › ⬤  debug     CMD: [ -f '/etc/letsencrypt/credentials/credentials-42' ] || {....}
[11/5/2025] [9:06:11 AM] [Certbot  ] › ▶  start     Installing namecheap...
[11/5/2025] [9:06:11 AM] [Global   ] › ⬤  debug     CMD: . /opt/certbot/bin/activate && pip install --no-cache-dir  certbot-dns-namecheap~=1.0.0  && deactivate
[11/5/2025] [9:06:19 AM] [Certbot  ] › ☒  complete  Installed namecheap
[11/5/2025] [9:06:19 AM] [Setup    ] › ℹ  info      Added Certbot plugins namecheap
[11/5/2025] [9:06:19 AM] [Setup    ] › ℹ  info      Logrotate Timer initialized
[11/5/2025] [9:06:19 AM] [Global   ] › ⬤  debug     CMD: logrotate /etc/logrotate.d/nginx-proxy-manager
[11/5/2025] [9:06:19 AM] [Setup    ] › ℹ  info      Logrotate completed.
[11/5/2025] [9:06:19 AM] [Global   ] › ℹ  info      IP Ranges fetch is enabled
[11/5/2025] [9:06:19 AM] [IP Ranges] › ℹ  info      Fetching IP Ranges from online services...
[11/5/2025] [9:06:19 AM] [IP Ranges] › ℹ  info      Fetching https://ip-ranges.amazonaws.com/ip-ranges.json
[11/5/2025] [9:06:19 AM] [IP Ranges] › ℹ  info      Fetching https://www.cloudflare.com/ips-v4
[11/5/2025] [9:06:19 AM] [IP Ranges] › ℹ  info      Fetching https://www.cloudflare.com/ips-v6
[11/5/2025] [9:06:19 AM] [SSL      ] › ℹ  info      Let's Encrypt Renewal Timer initialized
[11/5/2025] [9:06:19 AM] [SSL      ] › ℹ  info      Renewing SSL certs expiring within 30 days ...
[11/5/2025] [9:06:19 AM] [IP Ranges] › ℹ  info      IP Ranges Renewal Timer initialized
[11/5/2025] [9:06:19 AM] [Global   ] › ℹ  info      Backend PID 220 listening on port 3000 ...
[11/5/2025] [9:06:19 AM] [SSL      ] › ℹ  info      Completed SSL cert renew process
```

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Uncaught TypeError: e.split is not a function when migrating from 2.12.6 to 2.13.1 #4844

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Uncaught TypeError: e.split is not a function when migrating from 2.12.6 to 2.13.1 #4844

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