diff --git a/app.py b/app.py
index 0557d3a..44b63b9 100644
--- a/app.py
+++ b/app.py
@@ -2936,7 +2936,7 @@ function populateSel(){
 
   const srcEl=$('src-select'), srcPrev=srcEl.value;
   srcEl.innerHTML = blank('Gerät einstecken, dann hier wählen')
-    + mkOpts(d => !srcSet.has(d.usb_port) && ((cfg.dest_type||'usb')==='internal' || d.usb_port !== cfg.dest_port));
+    + mkOpts(d => !srcSet.has(d.usb_port) && ((cfg.dest_type||'usb')==='internal' || !cfg.dest_port || d.usb_port !== cfg.dest_port));
   if(srcPrev && devs.find(d=>d.usb_port===srcPrev)) srcEl.value=srcPrev;
 
   const dstEl=$('dst-select'), dstPrev=dstEl.value;
@@ -2961,7 +2961,7 @@ function onDestTypeChange(markDirty=true){
 
 function renderUnassigned(){
   const srcSet = new Set((cfg.source_ports||[]).map(sp=>sp.port));
-  const list=devs.filter(d=>!srcSet.has(d.usb_port)&&(((cfg.dest_type||'usb')==='internal')||d.usb_port!==cfg.dest_port));
+  const list=devs.filter(d=>!srcSet.has(d.usb_port)&&((cfg.dest_type||'usb')==='internal'||!cfg.dest_port||d.usb_port!==cfg.dest_port));
   const w=$('unassigned-wrap');
   if(!list.length){w.style.display='none';return;}
   w.style.display='block';
diff --git a/version.txt b/version.txt
index 633e893..260e057 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.0.60
\ No newline at end of file
+1.0.61
\ No newline at end of file