diff --git a/build-plugin.sh b/build-plugin.sh
index 4c2c627..01e4990 100755
--- a/build-plugin.sh
+++ b/build-plugin.sh
@@ -2,7 +2,7 @@
 set -eu
 
 PLUGIN="u-navigator"
-VERSION="2026.06.23.r014"
+VERSION="2026.06.23.r015"
 PKG_DIR="packages"
 WORK_DIR=".plugin-build"
 PKG_NAME="${PLUGIN}-${VERSION}.tgz"
diff --git a/packages/u-navigator-2026.06.23.r014.tgz b/packages/u-navigator-2026.06.23.r014.tgz
deleted file mode 100644
index 3bebf93..0000000
Binary files a/packages/u-navigator-2026.06.23.r014.tgz and /dev/null differ
diff --git a/packages/u-navigator-2026.06.23.r015.tgz b/packages/u-navigator-2026.06.23.r015.tgz
new file mode 100644
index 0000000..c7f5b04
Binary files /dev/null and b/packages/u-navigator-2026.06.23.r015.tgz differ
diff --git a/server/public/app.js b/server/public/app.js
index 6174e80..3df80c1 100644
--- a/server/public/app.js
+++ b/server/public/app.js
@@ -727,6 +727,7 @@ function startItemPointerDrag(event, win, entry) {
     sourceWindowId: win.id,
     path: entry.path,
     name: entry.name,
+    type: entry.type,
     startX: event.clientX,
     startY: event.clientY,
     active: false,
@@ -756,6 +757,7 @@ function updateItemPointerDrag(event) {
   event.preventDefault();
   document.body.classList.add('u-nav-dragging');
   markDraggingRow(drag.path, true);
+  markDropCandidates(drag.path, true);
   updatePointerDropTarget(event);
 }
 
@@ -769,6 +771,7 @@ async function finishItemPointerDrag(event, move, up) {
   if (!drag) return;
 
   markDraggingRow(drag.path, false);
+  markDropCandidates(drag.path, false);
   state.pointerDrag = null;
 
   if (!drag.active) {
@@ -794,6 +797,9 @@ async function finishItemPointerDrag(event, move, up) {
     if (destination === drag.path) {
       throw new Error('Quelle und Ziel sind identisch.');
     }
+    if (drag.type === 'directory' && target.path.startsWith(`${drag.path.replace(/\/$/, '')}/`)) {
+      throw new Error('Ein Ordner kann nicht in sich selbst verschoben werden.');
+    }
     await createJob(event.altKey ? 'copy' : 'move', drag.path, destination, [drag.sourceWindowId, target.windowId]);
   } catch (error) {
     showError(error);
@@ -825,8 +831,10 @@ function clearPointerDropTarget() {
 
 function findPointerDropTarget(event) {
   let element;
+  let elements = [];
   try {
     element = document.elementFromPoint(event.clientX, event.clientY);
+    elements = document.elementsFromPoint ? document.elementsFromPoint(event.clientX, event.clientY) : [element];
   } catch (error) {
     recordDebug('elementFromPoint.error', {
       x: event.clientX,
@@ -847,13 +855,30 @@ function findPointerDropTarget(event) {
   const win = state.windows.find((item) => item.id === windowEl.dataset.windowId);
   if (!win || win.kind !== 'explorer') return null;
 
-  let row;
-  try {
-    row = element.closest?.('.file-row');
-  } catch (error) {
-    recordDebug('closest.row.error', { error: serializeError(error), element: element?.tagName });
+  const drag = state.pointerDrag;
+  let row = null;
+  for (const candidate of elements) {
+    try {
+      const candidateRow = candidate.closest?.('.file-row');
+      if (!candidateRow || candidateRow.dataset.type !== 'directory') {
+        continue;
+      }
+      if (candidateRow.dataset.path === drag?.path) {
+        continue;
+      }
+      if (drag?.type === 'directory' && candidateRow.dataset.path.startsWith(`${drag.path.replace(/\/$/, '')}/`)) {
+        continue;
+      }
+      if (candidateRow.closest?.('.window') !== windowEl) {
+        continue;
+      }
+      row = candidateRow;
+      break;
+    } catch (error) {
+      recordDebug('closest.row.error', { error: serializeError(error), element: candidate?.tagName });
+    }
   }
-  if (row?.dataset.type === 'directory') {
+  if (row) {
     return { windowId: win.id, path: row.dataset.path, row };
   }
 
@@ -868,6 +893,15 @@ function markDraggingRow(path, dragging) {
   }
 }
 
+function markDropCandidates(sourcePath, active) {
+  const source = state.pointerDrag;
+  for (const row of workspace.querySelectorAll('.file-row[data-type="directory"]')) {
+    const path = row.dataset.path || '';
+    const valid = path !== sourcePath && !(source?.type === 'directory' && path.startsWith(`${sourcePath.replace(/\/$/, '')}/`));
+    row.classList.toggle('drop-candidate', active && valid);
+  }
+}
+
 function lockExplorerScroll(win, body) {
   win.data.lockScroll = true;
   win.data.lockScrollTop = body.scrollTop;
diff --git a/server/public/styles.css b/server/public/styles.css
index e938e23..9f710ab 100644
--- a/server/public/styles.css
+++ b/server/public/styles.css
@@ -255,6 +255,7 @@
 .u-nav .file-row:hover,
 .u-nav .file-row.selected,
 .u-nav .file-row.dragging,
+.u-nav .file-row.drop-candidate,
 .u-nav .file-row.drop-target {
   background: var(--surface-2);
 }
@@ -262,10 +263,15 @@
 .u-nav .file-row:hover td,
 .u-nav .file-row.selected td,
 .u-nav .file-row.dragging td,
+.u-nav .file-row.drop-candidate td,
 .u-nav .file-row.drop-target td {
   background: var(--surface-2) !important;
 }
 
+.u-nav .file-row.drop-candidate td:first-child {
+  box-shadow: inset 3px 0 0 color-mix(in srgb, var(--accent) 72%, transparent);
+}
+
 .u-nav .file-row {
   -webkit-user-drag: none;
   user-select: none;
@@ -327,16 +333,22 @@
 .u-nav .icon-item:hover,
 .u-nav .icon-item.selected,
 .u-nav .icon-item.dragging,
+.u-nav .icon-item.drop-candidate,
 .u-nav .icon-item.drop-target {
   background: var(--surface-2);
   border-color: var(--line);
 }
 
 .u-nav .icon-item.selected,
+.u-nav .icon-item.drop-candidate,
 .u-nav .icon-item.drop-target {
   border-color: var(--accent);
 }
 
+.u-nav .icon-item.drop-candidate {
+  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 45%, transparent);
+}
+
 .u-nav .file-icon {
   display: block;
   height: 52px;
diff --git a/u-navigator.plg b/u-navigator.plg
index c93f6c9..e9f82f2 100644
--- a/u-navigator.plg
+++ b/u-navigator.plg
@@ -1,7 +1,7 @@
 <!DOCTYPE PLUGIN [
 <!ENTITY name "u-navigator">
 <!ENTITY author "michael">
-<!ENTITY version "2026.06.23.r014">
+<!ENTITY version "2026.06.23.r015">
 <!ENTITY package "&name;-&version;.tgz">
 ]>
 <PLUGIN name="&name;" author="&author;" version="&version;" pluginURL="https://git.casaderoll.de/michael/Unraid-Navigator/raw/branch/main/u-navigator.plg">
@@ -14,7 +14,7 @@
 
 <FILE Name="/boot/config/plugins/&name;/&package;">
 <URL>https://git.casaderoll.de/michael/Unraid-Navigator/raw/branch/main/packages/&package;</URL>
-<MD5>0100a8a8507d664658a9451a40881944</MD5>
+<MD5>5dd13445e7847e581364f61f5fd26808</MD5>
 </FILE>
 
 <FILE Run="/bin/bash">