diff --git a/src/SayMore/Transcription/UI/TextAnnotationGrid/TranscriptionAnnotationColumn.cs b/src/SayMore/Transcription/UI/TextAnnotationGrid/TranscriptionAnnotationColumn.cs
index 50be54f6..e64d1333 100644
--- a/src/SayMore/Transcription/UI/TextAnnotationGrid/TranscriptionAnnotationColumn.cs
+++ b/src/SayMore/Transcription/UI/TextAnnotationGrid/TranscriptionAnnotationColumn.cs
@@ -67,7 +67,11 @@ protected override IEnumerable<ToolStripMenuItem> GetPlaybackOptionMenus()
 		protected override void SetFont(System.Drawing.Font newFont)
 		{
 			base.SetFont(newFont);
-			_grid.TranscriptionFont = newFont;
+			lock (this)
+			{
+				if (_grid != null)
+					_grid.TranscriptionFont = newFont;
+			}
 		}
 	}
 }