diff --git a/ICSharpCode.TextEditorLinux/Src/Gui/TextView.cs b/ICSharpCode.TextEditorLinux/Src/Gui/TextView.cs
index c631eb41c..cdf21d4cd 100644
--- a/ICSharpCode.TextEditorLinux/Src/Gui/TextView.cs
+++ b/ICSharpCode.TextEditorLinux/Src/Gui/TextView.cs
@@ -778,9 +778,10 @@ namespace ICSharpCode.TextEditor
 		public int GetVisualColumn(int logicalLine, int logicalColumn)
 		{
 			int column = 0;
-			using (Graphics g = textArea.CreateGraphics()) {
-				CountColumns(ref column, 0, logicalColumn, logicalLine, g);
-			}
+   			if (TextArea.Document.TextContent.Length > 0) //fix crush under linux after clear document content - no content = zero columns
+				using (Graphics g = textArea.CreateGraphics()) {
+					CountColumns(ref column, 0, logicalColumn, logicalLine, g);
+				}
 			return column;
 		}
 		
diff --git a/TreeConverter/NetWrappers/AssemblyResolveScope.cs b/TreeConverter/NetWrappers/AssemblyResolveScope.cs
index 972fcadb5..6148b51b9 100644
--- a/TreeConverter/NetWrappers/AssemblyResolveScope.cs
+++ b/TreeConverter/NetWrappers/AssemblyResolveScope.cs
@@ -146,6 +146,8 @@ namespace PascalABCCompiler.NetHelper
 
         private Assembly OnAssemblyResolve(object obj, ResolveEventArgs args)
         {
+            if (args.RequestingAssembly == null) //fix Linux/Mono IDE missworking after loading a huge pas source such as GraphABC.pas or GraphABCHelper.pas
+                return null;
             var requestedName = new AssemblyName(args.Name);
             if (_assembliesByName.TryGetValue(requestedName.Name, out var assembly))
                 return assembly;
@@ -177,4 +179,4 @@ namespace PascalABCCompiler.NetHelper
             return null;
         }
     }
-}
\ No newline at end of file
+}