diff --git a/transmission/CHANGELOG.md b/transmission/CHANGELOG.md
index 918fed3b92..6c3cb51dca 100644
--- a/transmission/CHANGELOG.md
+++ b/transmission/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 4.1.3.1 (2026-09-12)
+- Add `incomplete_dir_enabled` (default `true`): set to `false` to permanently disable the incomplete-downloads directory. Restarting the add-on always overwrote Transmission's own Web UI toggle for this back to enabled (#3059); this option is read on every restart instead, so it actually sticks
+- Fix a latent bug in the same code: an install where `incomplete_dir` was entirely absent from options (rather than emptied) would create and use a directory literally named `null`
  
 ## 4.1.3 (2026-07-04)
 - Update to latest version from linuxserver/docker-transmission (changelog : https://github.com/linuxserver/docker-transmission/releases)
diff --git a/transmission/README.md b/transmission/README.md
index 3f0f2fe702..8793c094db 100644
--- a/transmission/README.md
+++ b/transmission/README.md
@@ -62,6 +62,7 @@ Configurations can be done through the app webUI, except for the following optio
 | `TZ` | str | | Timezone (e.g., `Europe/London`) |
 | `download_dir` | str | `/share/downloads` | Directory for completed downloads |
 | `incomplete_dir` | str | `/share/incomplete` | Directory for incomplete downloads |
+| `incomplete_dir_enabled` | bool | `true` | Set to `false` to permanently disable the incomplete-downloads directory. Transmission's own Web UI toggle for this is overwritten on every add-on restart, so use this option instead |
 | `watch_dir` | str | | Directory to watch for torrent files |
 | `customUI` | list | `flood-for-transmission` | Web UI (standard/transmission-web-control/kettu/flood-for-transmission) |
 | `user` | str | | Web UI username |
diff --git a/transmission/config.yaml b/transmission/config.yaml
index 9cbb2cc274..3d0cdf95f6 100644
--- a/transmission/config.yaml
+++ b/transmission/config.yaml
@@ -87,6 +87,7 @@ options:
   customUI: flood-for-transmission
   download_dir: /share/downloads
   incomplete_dir: /share/incomplete
+  incomplete_dir_enabled: true
 panel_admin: false
 panel_icon: mdi:transmission-tower
 ports:
@@ -114,6 +115,7 @@ schema:
   customUI: list(standard|transmission-web-control|kettu|flood-for-transmission)
   download_dir: str
   incomplete_dir: str?
+  incomplete_dir_enabled: bool?
   localdisks: str?
   networkdisks: str?
   pass: str?
@@ -124,4 +126,4 @@ schema:
 slug: transmission_ls
 udev: true
 url: https://github.com/alexbelgium/hassio-addons
-version: "4.1.3"
+version: "4.1.3.1"
diff --git a/transmission/rootfs/etc/cont-init.d/01-config.sh b/transmission/rootfs/etc/cont-init.d/01-config.sh
index 74edc048d4..13398d57df 100755
--- a/transmission/rootfs/etc/cont-init.d/01-config.sh
+++ b/transmission/rootfs/etc/cont-init.d/01-config.sh
@@ -57,6 +57,15 @@ bashio::log.warning "If UI was changed, you need to clear browser cache for it t
 echo "Creating config"
 download_dir=$(bashio::config 'download_dir')
 incomplete_dir=$(bashio::config 'incomplete_dir')
+# bashio::config prints the literal string "null" for an absent option (its
+# own default-value argument cannot be an empty string: bash's ${2:-null}
+# treats "" the same as unset). Without this, an option missing entirely
+# (upgrade from before this key existed) would count as a 4-character dir and
+# create one literally named "null"
+[ "$incomplete_dir" = "null" ] && incomplete_dir=""
+# Enabled unless explicitly false: an absent key reads as "null" in bashio and
+# as "" in the standalone shim, which ignores bashio::config's default argument
+incomplete_dir_enabled=$(bashio::config 'incomplete_dir_enabled')
 CONFIG=$(< $CONFIGDIR/settings.json)
 
 # Permissions
@@ -64,8 +73,11 @@ echo "Updating permissions"
 mkdir -p "$download_dir"
 chown "$PUID:$PGID" "$download_dir"
 
-# if incomplete dir > 2, to allow both null and '', set it as existing
-if [ ${#incomplete_dir} -ge 2 ]; then
+# The addon's own toggle wins on every restart, which is the point: Transmission's
+# Web UI toggle is overwritten here regardless, so a permanent "off" has to come
+# from an option this script reads, not from the Web UI (issue #3059). A dir
+# shorter than 2 characters (empty, "/") is treated as unset either way.
+if [ "$incomplete_dir_enabled" != "false" ] && [ ${#incomplete_dir} -ge 2 ]; then
     echo "Incomplete dir set: $incomplete_dir"
     CONFIG=$(bashio::jq "${CONFIG}" ".\"incomplete-dir-enabled\"=true")
     mkdir -p "$incomplete_dir"