diff --git a/doc/source/main/tools.rst b/doc/source/main/tools.rst
index 764c715..20913ca 100644
--- a/doc/source/main/tools.rst
+++ b/doc/source/main/tools.rst
@@ -437,3 +437,17 @@ Execute `stop_clock` for stop timer.
     21/06/2021 22:43:47 - DEBUG - 22:43:47.128487
     21/06/2021 22:43:47 - INFO - Timer stopped... show_time
 
+
+Get digest
+^^^^^^^^^^
+
+.. code-block:: bash
+
+    data = 'LibreOffice with Python'
+
+    digest = app.sha256(data)
+    app.msgbox(digest)
+
+    digest = app.sha512(data)
+    app.msgbox(digest)
+
diff --git a/source/easymacro.py b/source/easymacro.py
index cf7a8c5..dfefab8 100644
--- a/source/easymacro.py
+++ b/source/easymacro.py
@@ -687,6 +687,7 @@ def sha256(data):
     result = hashlib.sha256(data.encode()).hexdigest()
     return result
 
+
 def sha512(data):
     result = hashlib.sha512(data.encode()).hexdigest()
     return result
@@ -743,12 +744,16 @@ def render(template, data):
 
 
 def get_size_screen():
+    res = ''
     if IS_WIN:
         user32 = ctypes.windll.user32
         res = f'{user32.GetSystemMetrics(0)}x{user32.GetSystemMetrics(1)}'
     else:
-        args = 'xrandr | grep "*" | cut -d " " -f4'
-        res = run(args, split=False)
+        try:
+            args = 'xrandr | grep "*" | cut -d " " -f4'
+            res = run(args, split=False)
+        except Exception as e:
+            error(e)
     return res.strip()