diff --git a/src/gui/views/views.rs b/src/gui/views/views.rs
index 3e54413..eab2a76 100644
--- a/src/gui/views/views.rs
+++ b/src/gui/views/views.rs
@@ -23,6 +23,7 @@ use egui::epaint::text::TextWrapping;
 use egui::os::OperatingSystem;
 use egui::text::{LayoutJob, TextFormat};
 use egui::text_edit::TextEditState;
+use crate::AppConfig;
 
 use crate::gui::Colors;
 use crate::gui::icons::{CHECK_SQUARE, CLIPBOARD_TEXT, COPY, EYE, EYE_SLASH, SCAN, SQUARE};
@@ -63,8 +64,11 @@ impl View {
         ui.ctx().input(|i| {
             return match i.viewport().inner_rect {
                 None => {
-                    let size = i.viewport().monitor_size.unwrap();
-                    (size.x, size.y)
+                    if let Some(size) = i.viewport().monitor_size {
+                        (size.x, size.y)
+                    } else {
+                        (AppConfig::DEFAULT_WIDTH, AppConfig::DEFAULT_HEIGHT)
+                    }
                 }
                 Some(rect) => {
                     (rect.width(), rect.height())
diff --git a/src/settings/config.rs b/src/settings/config.rs
index bbc4bac..04d1e4c 100644
--- a/src/settings/config.rs
+++ b/src/settings/config.rs
@@ -47,9 +47,6 @@ pub struct AppConfig {
     lang: Option<String>
 }
 
-const DEFAULT_WIDTH: f32 = 1280.0;
-const DEFAULT_HEIGHT: f32 = 745.0;
-
 impl Default for AppConfig {
     fn default() -> Self {
         Self {
@@ -58,8 +55,8 @@ impl Default for AppConfig {
             android_integrated_node_warning: None,
             show_wallets_at_dual_panel: false,
             show_connections_network_panel: false,
-            width: DEFAULT_WIDTH,
-            height: DEFAULT_HEIGHT,
+            width: Self::DEFAULT_WIDTH,
+            height: Self::DEFAULT_HEIGHT,
             x: None,
             y: None,
             lang: None,
@@ -68,6 +65,11 @@ impl Default for AppConfig {
 }
 
 impl AppConfig {
+    /// Default window width.
+    pub const DEFAULT_WIDTH: f32 = 1280.0;
+    /// Default window height.
+    pub const DEFAULT_HEIGHT: f32 = 745.0;
+
     /// Application configuration file name.
     pub const FILE_NAME: &'static str = "app.toml";