diff --git a/IDE/src/ui/SourceEditWidgetContent.bf b/IDE/src/ui/SourceEditWidgetContent.bf
index 784a2484..b8ec089d 100644
--- a/IDE/src/ui/SourceEditWidgetContent.bf
+++ b/IDE/src/ui/SourceEditWidgetContent.bf
@@ -2758,7 +2758,7 @@ namespace IDE.ui
 				return;
 			}
 
-            if (CheckReadOnly())
+            if ((AllowChar(keyChar)) && (CheckReadOnly()))
             {
                 base.KeyChar(keyChar);
                 return;