diff --git a/companion/releasenotes.txt b/companion/releasenotes.txt
index 03cd9ad05..fd46126be 100644
--- a/companion/releasenotes.txt
+++ b/companion/releasenotes.txt
@@ -12,6 +12,7 @@
 <li>File path issue in Taranis simulator function <i>findTrueFileName()</i> on Windows (<a href=https://github.com/opentx/opentx/issues/2301>#2301</a>)</li>
 <li>Added simulator volume gain setting (<a href=https://github.com/opentx/opentx/issues/2260>#2260</a>)</li>
 <li>Added GPS glitch filtering and Latitude/Longitude position synchronization to Google Earth export (<a href=https://github.com/opentx/opentx/issues/2326>#2326</a>)</li>
+<li>Fixed a rare program crash when editing Input for 9X radio (<a href=https://github.com/opentx/opentx/issues/2420>#2420</a>)</li>
 </ul>
 
 
@@ -320,4 +321,4 @@
 <li>Try to reduce modeledit window form MAC</li>
 <li>Wrong init of RF-Module data</li>
 <li>Read flash from TX didn't worked for Taranis</li>
-</ul>
\ No newline at end of file
+</ul>
diff --git a/companion/src/modeledit/expodialog.cpp b/companion/src/modeledit/expodialog.cpp
index d64c0887c..10007c394 100644
--- a/companion/src/modeledit/expodialog.cpp
+++ b/companion/src/modeledit/expodialog.cpp
@@ -2,7 +2,8 @@
 #include "ui_expodialog.h"
 #include "helpers.h"
 
-ExpoDialog::ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expoData, GeneralSettings & generalSettings, Firmware * firmware, char * inputName) :
+ExpoDialog::ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expoData, GeneralSettings & generalSettings, 
+                          Firmware * firmware, QString & inputName) :
   QDialog(parent),
   ui(new Ui::ExpoDialog),
   model(model),
@@ -62,6 +63,8 @@ ExpoDialog::ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expoData, G
     ui->inputName->setMaxLength(4);
     populateSourceCB(ui->sourceCB, ed->srcRaw, generalSettings, &model, POPULATE_NONE | POPULATE_SOURCES | POPULATE_SWITCHES | POPULATE_TRIMS | POPULATE_TELEMETRY);
     ui->sourceCB->removeItem(0);
+    ui->inputName->setValidator(new QRegExpValidator(rx, this));
+    ui->inputName->setText(inputName);
   }
   else {
     ui->inputNameLabel->hide();
@@ -87,9 +90,6 @@ ExpoDialog::ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expoData, G
     ui->lineName->setMaxLength(expolength);
   }
 
-  ui->inputName->setValidator(new QRegExpValidator(rx, this));
-  ui->inputName->setText(inputName);
-
   ui->lineName->setValidator(new QRegExpValidator(rx, this));
   ui->lineName->setText(ed->name);
 
@@ -153,7 +153,8 @@ void ExpoDialog::valuesChanged()
     ed->mode   = ui->sideCB->currentIndex() + 1;
 
     strcpy(ed->name, ui->lineName->text().toAscii().data());
-    strcpy(inputName, ui->inputName->text().toAscii().data());
+    if (firmware->getCapability(VirtualInputs)) 
+      inputName = ui->inputName->text();
 
     ed->phases=0;
     for (int i=8; i>=0 ; i--) {
diff --git a/companion/src/modeledit/expodialog.h b/companion/src/modeledit/expodialog.h
index 5f683bf69..b4b40f803 100644
--- a/companion/src/modeledit/expodialog.h
+++ b/companion/src/modeledit/expodialog.h
@@ -14,7 +14,8 @@ namespace Ui {
 class ExpoDialog : public QDialog {
     Q_OBJECT
   public:
-    ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expodata, GeneralSettings & generalSettings, Firmware * firmware, char * inputName);
+    ExpoDialog(QWidget *parent, ModelData & model, ExpoData *expodata, GeneralSettings & generalSettings, 
+                Firmware * firmware, QString & inputName);
     ~ExpoDialog();
 
   protected:
@@ -30,7 +31,7 @@ class ExpoDialog : public QDialog {
     GeneralSettings & generalSettings;
     Firmware * firmware;
     ExpoData * ed;
-    char * inputName;
+    QString & inputName;
     GVarGroup * gvWeightGroup;
     GVarGroup * gvOffsetGroup;
     CurveGroup * curveGroup;
diff --git a/companion/src/modeledit/inputs.cpp b/companion/src/modeledit/inputs.cpp
index a3b7dcc10..9d5580672 100644
--- a/companion/src/modeledit/inputs.cpp
+++ b/companion/src/modeledit/inputs.cpp
@@ -216,19 +216,18 @@ void InputsPanel::gm_openExpo(int index)
     if(index<0 || index>=C9X_MAX_EXPOS) return;
 
     ExpoData mixd(model->expoData[index]);
-    char inputName[4+1];
     emit modified();
     update();
-    
-    if (firmware->getCapability(VirtualInputs)) {
-      strcpy(inputName, model->inputNames[mixd.chn]);
-    }
+
+    QString inputName;
+    if (firmware->getCapability(VirtualInputs))
+      inputName = model->inputNames[mixd.chn];
 
     ExpoDialog *g = new ExpoDialog(this, *model, &mixd, generalSettings, firmware, inputName);
     if (g->exec())  {
       model->expoData[index] = mixd;
       if (firmware->getCapability(VirtualInputs))
-        strcpy(model->inputNames[mixd.chn], inputName);
+        strncpy(model->inputNames[mixd.chn], inputName.toAscii().data(), 4);
       emit modified();
       update();
     }