diff --git a/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs b/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
index 8d2b5b993..cf626bdac 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/CheckComboBox/CheckComboBox.cs
@@ -196,7 +196,7 @@ public bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/ComboBox.cs b/src/Shared/HandyControl_Shared/Controls/Input/ComboBox.cs
index d178848c8..94c838ef9 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/ComboBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/ComboBox.cs
@@ -368,7 +368,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/DatePicker.cs b/src/Shared/HandyControl_Shared/Controls/Input/DatePicker.cs
index 66fe911ee..515d62d99 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/DatePicker.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/DatePicker.cs
@@ -164,7 +164,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/DateTimePicker.cs b/src/Shared/HandyControl_Shared/Controls/Input/DateTimePicker.cs
index db1543c36..b694bbb7d 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/DateTimePicker.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/DateTimePicker.cs
@@ -447,7 +447,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/NumericUpDown.cs b/src/Shared/HandyControl_Shared/Controls/Input/NumericUpDown.cs
index ab2247d82..a1d209270 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/NumericUpDown.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/NumericUpDown.cs
@@ -128,7 +128,7 @@ private void UpdateData()
 
                 if (Validation.GetHasError(this))
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                     SetCurrentValue(IsErrorProperty, ValueBoxes.TrueBox);
                 }
             }
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/PasswordBox.cs b/src/Shared/HandyControl_Shared/Controls/Input/PasswordBox.cs
index 49e0d64da..7f85902cc 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/PasswordBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/PasswordBox.cs
@@ -269,7 +269,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/TextBox.cs b/src/Shared/HandyControl_Shared/Controls/Input/TextBox.cs
index 6cf338eb6..ba7a2e9a1 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/TextBox.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/TextBox.cs
@@ -123,7 +123,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {
diff --git a/src/Shared/HandyControl_Shared/Controls/Input/TimePicker.cs b/src/Shared/HandyControl_Shared/Controls/Input/TimePicker.cs
index 2a39fe1de..921f7f546 100644
--- a/src/Shared/HandyControl_Shared/Controls/Input/TimePicker.cs
+++ b/src/Shared/HandyControl_Shared/Controls/Input/TimePicker.cs
@@ -406,7 +406,7 @@ public virtual bool VerifyData()
                 isError = Validation.GetHasError(this);
                 if (isError)
                 {
-                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent);
+                    SetCurrentValue(ErrorStrProperty, Validation.GetErrors(this)[0].ErrorContent?.ToString());
                 }
                 else
                 {